Observation 49883: Aspicilia A.Massal.
When: 2010-08-07
Who: zaca
No herbarium specimen

Notes: Growing on a rock. Thallus dark grey-brown. No apothecia or perithecia was found. What can be?

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Thanks, Jason, for the information.
By: zaca
2010-08-08 22:04:47 CEST (+0200)
Maybe Aspicilia?
By: Jason Hollinger (jason)
2010-08-08 21:53:21 CEST (+0200)

There are a number of virtually indistinguishable gray Aspicilia in southern California (very similar coastal Mediterranean habitat). In fact, there are no fewer than 14 species described in the Sonoran Flora, Vol. III. They differ in the the following characters:

chemistry: K-, K+ yellow to orange or red
epihymenium: brown, bluish, greenish, changing to brown in K?
paraphyses: number of inflated cells at the end (moniliform?)
spore size: between 10 and 30 µm long
substrate: pH (calcareous or siliceous)
thallus: areolate?, thickness, contiguous or dispersed
color: brownish to grayish, uniform or splotchy, darker around apothecia?

Finding apothecia can be a real challenge, and even then finding mature spores can be equally challenging.

List of species in the Sonoran Flora:

K-:
A. cyanescens (bluish color)
A. contorta (calcareous)
A. confusa (dispersed)
A. caesiocinerea (submoniliform)
A. fumosa (coastal)
A. americana (interior)

K+ orange: (stictic acid)
A. pacifica (green epihymenium)
A. substictica (southern)
A. verrucigera (northern)

K+ red: (norstictic acid)
A. sipeana (dispersed)
A. brucei (small spores, not moniliform, green epihymenium)
A. cinerea (small spores, very moniliform, brown epihymenium)
A. arizonica (green epihymenium)
A. cuprea (brown epihymenium)

Good luck!

Created: 2010-08-08 21:19:56 CEST (+0200)
Last modified: 2010-08-14 20:38:58 CEST (+0200)
Viewed: 14 times, last viewed: 2016-03-24 11:22:46 CET (+0100)
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