Tar Spot of Maple (lower right) on a <a href='http://www.marylandbiodiversity.com/viewSpecies.php?species=1484'>Silver Maple</a> leaf in Howard Co., Maryland (10/24/2017). (Photo ID: 95428 - Psn: 20)

Tar Spot of Maple (lower right) on a Silver Maple leaf in Howard Co., Maryland (10/24/2017).

View Record Details Photo by Joanne Solem MBP List

Tar Spot of Maple (closeupo of stoma) on a <a href='http://www.marylandbiodiversity.com/viewSpecies.php?species=1484'>Silver Maple</a> leaf in Howard Co., Maryland (10/24/2017). (Photo ID: 95427 - Psn: 21)

Tar Spot of Maple (closeupo of stoma) on a Silver Maple leaf in Howard Co., Maryland (10/24/2017).

View Record Details Photo by Joanne Solem MBP List

Tar Spot of Maple on a <a href='http://www.marylandbiodiversity.com/viewSpecies.php?species=1483'>Red Maple</a> leaf in Howard Co., Maryland (10/24/2017). (Photo ID: 95430 - Psn: 26)

Tar Spot of Maple on a Red Maple leaf in Howard Co., Maryland (10/24/2017).

View Record Details Photo by Joanne Solem MBP List

Tar Spot of Maple on a <a href='http://www.marylandbiodiversity.com/viewSpecies.php?species=1485'>Sugar Maple</a> leaf in Howard Co., Maryland (10/29/2017). (Photo ID: 95429 - Psn: 30)

Tar Spot of Maple on a Sugar Maple leaf in Howard Co., Maryland (10/29/2017).

View Record Details Photo by Joanne Solem MBP List

Tar Spot of Maple in Montgomery Co., Maryland (10/18/2020). (c) Emily Summerbell, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 307117 - Psn: 44)

Tar Spot of Maple in Montgomery Co., Maryland (10/18/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Tar Spot of Maple in Montgomery Co., Maryland (10/18/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Tar Spot of Maple in Montgomery Co., Maryland (10/18/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Tar Spot of Maple in Montgomery Co., Maryland (10/18/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Tar Spot of Maple in Montgomery Co., Maryland (10/18/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Tar Spot of Maple in Montgomery Co., Maryland (10/18/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Tar Spot of Maple in Howard Co., Maryland (8/8/2016). (c) Joanne and Robert Solem, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 355812 - Psn: 60)

Tar Spot of Maple in Howard Co., Maryland (8/8/2016). (c) Joanne and Robert Solem, some rights reserved (CC BY-NC).

View Record Details Photo by Joanne Solem MBP List

Tar Spot of Maple in Garrett Co., Maryland (10/2/2017). (c) Randy Bodkins, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 217645 - Psn: 65)

Tar Spot of Maple in Garrett Co., Maryland (10/2/2017). (c) Randy Bodkins, some rights reserved (CC BY-NC).

View Record Details Photo by Randy Bodkins via iNaturalist MBP List

Tar Spot of Maple in Montgomery Co., Maryland (10/18/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Tar Spot of Maple in Montgomery Co., Maryland (10/18/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Tar Spot of Maple in Montgomery Co., Maryland (10/18/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Tar Spot of Maple in Montgomery Co., Maryland (10/18/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Tar Spot of Maple in Montgomery Co., Maryland (10/18/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Tar Spot of Maple in Montgomery Co., Maryland (10/18/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC).

View Record Details Photo by Emily Summerbell, Ph.D. via iNaturalist MBP List

Tar Spot of Maple in Anne Arundel Co., Maryland (10/26/2020). (c) Matthew Beziat, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 260426 - Psn: 88)

Tar Spot of Maple in Anne Arundel Co., Maryland (10/26/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC).

View Record Details Photo by Matthew Beziat MBP List

Tar Spot of Maple in Howard Co., Maryland (10/2/2020). (c) smuller, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 306757 - Psn: 88)

Tar Spot of Maple in Howard Co., Maryland (10/2/2020). (c) smuller, some rights reserved (CC BY-NC).

View Record Details Photo by Sue Muller MBP List

Spores of Tar Spot of Maple in Howard Co., Maryland (8/8/2016). (c) Joanne and Robert Solem, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 355813 - Psn: 100)

Spores of Tar Spot of Maple in Howard Co., Maryland (8/8/2016). (c) Joanne and Robert Solem, some rights reserved (CC BY-NC).

View Record Details Photo by Joanne Solem MBP List

Tar Spot of Maple in Anne Arundel Co., Maryland (3/20/2020). (c) cblkilchen, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 218942 - Psn: 125)

Tar Spot of Maple in Anne Arundel Co., Maryland (3/20/2020). (c) cblkilchen, some rights reserved (CC BY-NC).

View Record Details Photo by cblkilchen via iNaturalist MBP List

Tar Spot of Maple in Queen Anne's Co., Maryland (11/4/2020). (c) Matthew Beziat, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 301408 - Psn: 200)

Tar Spot of Maple in Queen Anne's Co., Maryland (11/4/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC).

View Record Details Photo by Matthew Beziat MBP List

Tar Spot of Maple in Carroll Co., Maryland (12/25/2020). (c) Emilio Concari, some rights reserved (<a rel='license' href='http://creativecommons.org/licenses/by-nc/4.0/'>CC BY-NC</a>). (Photo ID: 327512 - Psn: 200)

Tar Spot of Maple in Carroll Co., Maryland (12/25/2020). (c) Emilio Concari, some rights reserved (CC BY-NC).

View Record Details Photo by Emilio Concari MBP List

Map Snapshot

35 Records

GA AL WA FR CL MO HO BA BC HA CE PG AA CV CH SM KE QA CN TA DO WI SO WO

Status

This is a microscopic fungus. Observation without microscopic confirmation are speculative.

Description

Fruiting body: Black, irregular/circular, slightly raised spots with wrinkles/ridges (J. Solem, pers. comm.). Observation of microscopic features is necessary to distinguish this species from other fungi causing tar spots (e.g., Rhytisma acerinum).

Where To Find

Solitary or groups of raised black spots on decaying maple leaves (J. Solem, pers. comm.).

Seasonality Summary

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Resources

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Citations

No citations linked for this taxon yet.

Eating mushrooms can be dangerous. One should do so only with expert advice and great care. MBP accepts no liability for injury sustained in consuming fungi or other biodiversity. Use of media featured on Maryland Biodiversity Project is only permitted with express permission of the photographer.

Tar Spot of Maple (lower right) on a Silver Maple leaf in Howard Co., Maryland (10/24/2017). View Record Details Media by Joanne Solem.

Tar Spot of Maple (closeupo of stoma) on a Silver Maple leaf in Howard Co., Maryland (10/24/2017). View Record Details Media by Joanne Solem.

Tar Spot of Maple on a Red Maple leaf in Howard Co., Maryland (10/24/2017). View Record Details Media by Joanne Solem.

Tar Spot of Maple on a Sugar Maple leaf in Howard Co., Maryland (10/29/2017). View Record Details Media by Joanne Solem.

Tar Spot of Maple in Montgomery Co., Maryland (10/18/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC). View Record Details Media by Emily Summerbell, Ph.D. via iNaturalist.

Tar Spot of Maple in Howard Co., Maryland (8/8/2016). (c) Joanne and Robert Solem, some rights reserved (CC BY-NC). View Record Details Media by Joanne Solem.

Tar Spot of Maple in Garrett Co., Maryland (10/2/2017). (c) Randy Bodkins, some rights reserved (CC BY-NC). View Record Details Media by Randy Bodkins via iNaturalist.

Tar Spot of Maple in Montgomery Co., Maryland (10/18/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC). View Record Details Media by Emily Summerbell, Ph.D. via iNaturalist.

Tar Spot of Maple in Anne Arundel Co., Maryland (10/26/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). View Record Details Media by Matthew Beziat.

Tar Spot of Maple in Howard Co., Maryland (10/2/2020). (c) smuller, some rights reserved (CC BY-NC). View Record Details Media by Sue Muller.

Spores of Tar Spot of Maple in Howard Co., Maryland (8/8/2016). (c) Joanne and Robert Solem, some rights reserved (CC BY-NC). View Record Details Media by Joanne Solem.

Tar Spot of Maple in Anne Arundel Co., Maryland (3/20/2020). (c) cblkilchen, some rights reserved (CC BY-NC). View Record Details Media by cblkilchen via iNaturalist.

Tar Spot of Maple in Queen Anne's Co., Maryland (11/4/2020). (c) Matthew Beziat, some rights reserved (CC BY-NC). View Record Details Media by Matthew Beziat.

Tar Spot of Maple in Carroll Co., Maryland (12/25/2020). (c) Emilio Concari, some rights reserved (CC BY-NC). View Record Details Media by Emilio Concari.

Source: Wikipedia

Rhytisma americanum

Scientific classification
Kingdom:	Fungi
Division:	Ascomycota
Class:	Leotiomycetes
Order:	Rhytismatales
Family:	Rhytismataceae
Genus:	Rhytisma
Species:	R. americanum
Binomial name
*Rhytisma americanum* Hudler & Banik

Rhytisma americanum is a species of ascomycete fungus in the family Rhytismataceae. It was described in 1998 by W. Hudler and M. Banik in the journal Mycotaxon.^[1] The species belongs to the genus Rhytisma, a group of tarspot fungi within the order Rhytismatales.^[2]

Distribution

[edit]

Rhytisma americanum has been recorded from North America. Occurrences are documented in fungus collection databases and biodiversity aggregators.^[3]

References

[edit]

^ Hudler, W.; Banik, M. (1998). "Rhytisma americanum". Mycotaxon. 68: 411–420.
^ "Rhytisma americanum". MycoBank. Westerdijk Fungal Biodiversity Institute. Retrieved 2026-01-07.
^ "Rhytisma americanum Hudler & Banik". GBIF. Global Biodiversity Information Facility. Retrieved 2026-01-07.

External links

[edit]

Rhytisma americanum in MycoBank.

Taxon identifiers
Rhytisma americanum	Wikidata: Q3429903 Wikispecies: Rhytisma americanum CoL: 4SXRN GBIF: 5494573 iNaturalist: 552771 IndexFungorum: 445349 MycoBank: 445349 NatureServe: 2.1152034 NCBI: 2480618 Open Tree of Life: 3710415 SpeciesFungorum: 445349

This Ascomycota-related article is a stub. You can help Wikipedia by adding missing information.

Tar Spot of Maple

Rhytisma americanum Hudler & Banik

Synonyms

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