Tar Spot of Maple Rhytisma americanum Hudler & Banik    
Kingdom Fungi   >   Phylum Ascomycota   >   Class Leotiomycetes   >   Order Rhytismatales   >   Family Rhytismataceae   >   Genus Rhytisma   

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.).

There are 13 records in the project database.

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GA ALWAFRCL MO HO BABCHA CEPGAA CVCHSMKEQA CNTADOWISOWO
Tar Spot of Maple (lower right) on a Silver Maple leaf in Howard Co., Maryland (10/24/2017). Photo by Joanne Solem. (MBP list)

Tar Spot of Maple (closeupo of stoma) on a Silver Maple leaf in Howard Co., Maryland (10/24/2017). Photo by Joanne Solem. (MBP list)

Tar Spot of Maple on a Red Maple leaf in Howard Co., Maryland (10/24/2017). Photo by Joanne Solem. (MBP list)

Tar Spot of Maple on a Sugar Maple leaf in Howard Co., Maryland (10/29/2017). Photo by Joanne Solem. (MBP list)

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

Tar Spot of Maple in Garrett Co., Maryland (10/2/2017). (c) Randy Bodkins, some rights reserved (CC BY-NC). 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). 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). 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). 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). 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). 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). 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 (CC BY-NC). Photo by Matthew Beziat via iNaturalist. (MBP list)

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

Tar Spot of Maple in Anne Arundel Co., Maryland (3/20/2020). (c) cblkilchen, some rights reserved (CC BY-NC). 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 (CC BY-NC). Photo by Matthew Beziat via iNaturalist. (MBP list)

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


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