Observation 223721: Scutellinia subhirtella Svrček

When: 2015-11-21

Collection location: Deer Lakes Park, Tarentum, Allegheny Co., Pennsylvania, USA [Click for map]

40.6181° -79.8178° 335m

Who: Richard Jacob (lostculture)

No specimen available

This is the first time I have tried to identify a fungi with a microscope so take the ID with a pinch of salt. I though I had Scutellinia setosa but the spores were not smooth. . .
After reading Ascomycete Fungi of North America by Beug, Bessette and Bessette I think I have Scutellinia pennsylvanica. I would appreciate some expert advice though.

Found growing on very wet and rotten wood next to a stream.

Species Lists


Scutellinia pennsylvanica. By Richard Jacob.jpg
Scutellinia pennsylvanica. Margin hairs 2. By Richard Jacob.jpg
Margin hairs 450 – 700um
Scutellinia pennsylvanica. Spores 2. By Richard Jacob.jpg
Spores 17 × 10um
Scutellinia pennsylvanica. Margin hairs. By Richard Jacob.jpg
Scutellinia pennsylvanica. Spores. By Richard Jacob.jpg
Spores 17 × 10um

Proposed Names

-8% (2)
Used references: Ascomycete Fungi of North America by Beug, Bessette and Bessette
Based on microscopic features: Spore size and decoration and marginal hair length.
60% (2)
Based on microscopic features

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
another observation
By: Malcolm (Flaxton)
2015-12-01 17:49:22 CST (-0600)

I have added my own observation of this species.

hooray for Scutellinia gumshoeing!
By: Danny Newman (myxomop)
2015-11-30 16:29:34 CST (-0600)

thank you Malcom and Richard for digging deep into this complicated group with great microscopic data and debate.

By: Malcolm (Flaxton)
2015-11-29 15:47:45 CST (-0600)

I used the key of Schumacher. Yes your spore measurements are slightly small I still think S subhirtella is the most likely.
The spore size/ornamentation and the hair length/root form are the essentials for the identification of this group.

Scutellinia subhirtella -I like that
By: Richard Jacob (lostculture)
2015-11-28 10:38:26 CST (-0600)

Hi Mal,
Thank you for taking a look at this. May I ask which key you used?

Last night I read the original Mycologia publication for S pennsylvanica and there was a picture of the spores and I would agree that they do not look the same as these ones.

Some Species of the Genus Scutellinia, William C. Denison, Mycologia, Vol. 51, No. 5 (Sep. – Oct., 1959), pp. 605-635

There are a lot of images of Scutellinia subhirtella spores on the web and I will compare to these (with a pinch of salt). I also had a look at the Ceská Mykologie publication and I would say that these spores are slightly smaller, 1um length, but that may be more of my measurements rather than the actual spores. The hairs do have bifurcate bases though which I had not noticed before hand.

Svrcek, M. 1971. Tschechoslowakische Arten der Discomycetengattung Scutellinia (Cooke) Lamb. emend. Le Gal (Pezizales) I. Ceská Mykologie. 25(2):77-87

This looks to be a bit more of a rabbit hole than I was expecting.

Not S pennsylvanica
By: Malcolm (Flaxton)
2015-11-28 08:14:33 CST (-0600)

Hi Richard
Although I am not an expert I have the keys of experts;)
Your spores show individual warts rather than the reticulum you would expect for S pennsylvanica. I think the most likely id (with this sized spores with small individual warts and hairs <500 with bifurcate bases) is Scutellinia subhirtella.

Created: 2015-11-22 22:07:38 CST (-0600)
Last modified: 2015-11-29 15:48:13 CST (-0600)
Viewed: 133 times, last viewed: 2017-12-18 10:31:04 CST (-0600)
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