Observation 20309: Radiigera Zeller

I tried keying these in:
Domínquez de Toledo, L.S. & Castellano, M.A. (1996). A Revision of the Genera Radiigera and Pyrenogaster. Mycologia 88(5): 863-884.

No attractive matches.

All the photos are from the same patch, but over a month apart. These mature very slowly and change color dramatically when exposed to sun and wind. They begin reddish-brown with orangey blotches, and fade to dull beige/tan or greenish from algal growth. Undersides of mature, exposed specimens retain the original color.

Texture very smooth when young, becoming slightly and finely granular-scaly in age.

Growing in mulched, rootbound soil under redwood, with one Douglas-Fir nearby.

Clamps present in the hyphae of the fertile inner surface.
Sliced peridium and spore mass white with faint pinkish tinges when young, spore mass becoming dark brownish-black.

Spores 5 × 5 microns, globose, verrucose, brown in KOH

Large, contorted elements on outer surface.

Species Lists


Copyright © 2009 Christian F. Schwarz
Fruitbodies at > 1 month of maturity
Copyright © 2009 Christian F. Schwarz
Young fruitbodies on 5 March 2009
Copyright © 2009 Christian F. Schwarz
Young fruitbody, sectioned
Copyright © 2009 Christian F. Schwarz
Microscopic transect of peridium, outer surface to left, next layer golden in KOH, followed by horizontally arranged hyphae, and pseudoparenchymatic inner layer (nearest to spore mass).
Copyright © 2009 Christian F. Schwarz
Elements of outer peridium.
Copyright © 2009 Christian F. Schwarz
Spore mass with sparsely septate, somewhat irregularly inflated hyphae with clamps (very difficult to see in this photo)
Copyright © 2009 Christian F. Schwarz
Verrucose, globose spores 5 × 5 microns
Brownish in KOH

Proposed Names

28% (1)
Recognized by sight
Based on microscopic features

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Add Comment
R. fuscogleba?
By: Christian (Christian Schwarz)
2009-04-16 17:04:56 CDT (-0500)

Looks similar to the one shown here:

But it didn’t key out.