Observation 128108: Fuscidea thomsonii Brodo & Wirth
When: 2013-02-08

Notes: on vertical slate above intertidal sand

As usual with me I’m not very confident with a genus new to me (assuming I got that right). It seems closest to F. thomsonii, and resembles it in the photo of fig.3 in Fryday 2008. According to Fryday it “is described from the Queen Charlotte Islands by Brodo & Wirth (1998) and is here reported for the first time from Alaska from two collections from the Aleutian Islands previously identified as F. lowensis”


note spore shapes (view full size)
note spores constricted at center

Proposed Names

28% (1)
Eye3 Eyes3
Used references: A. M. Fryday 2008: The genus Fuscidea (Fuscideaceae, lichenized Ascomycota) in North America. – Lichenologist 40(4): 295-328; Brodo, Irwin M., Sharnoff, Sylvia Duran and Sharnoff, Stephen (2001) Lichens of North America; Thomson, J.W. (1997) American Arctic Lichens, 2. The Microlichens
Based on microscopic features: hymenium 65u; paraphyses 2u diameter with a few branched; (sort of odd – apo section almost exploded on addition of KOH); tholus I+blue – see photos; spores 8/ascus ave. 10×5u hyaline oval to constricted in middle (very rarely 1-septate); see photos of tholus (which I find difficult to interpret)
Based on chemical features: thallus K-; medulla I+blue

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Spectacular photos of ascus stains!
By: Jason Hollinger (jason)
2014-02-07 14:24:43 PST (-0800)

I only just finally started to begin to feel comfortable reading them myself last summer. :) But to get a good photo?? Wow. I’m so impressed. This is one genus in particular I’ve really wanted to get a look at since it has such a distinctive ascus type. Thank you yet again for posting such thorough documentation of this interesting species!

Created: 2013-02-08 16:22:02 PST (-0800)
Last modified: 2013-02-08 16:22:11 PST (-0800)
Viewed: 45 times, last viewed: 2017-06-15 07:25:48 PDT (-0700)
Show Log