Observation 198765: Physconia isidiigera (Zahlbr.) Essl.
When: 2015-02-14
(35.4514° -120.6437° 280m)
Who: J-Dar
No herbarium specimen

Notes: On Valley Oak (Quercus lobata) branch.
Ok so this one hinges on whether or not there are isidia, so take a look at the miscroscope photo and let me know if these are isidia. This lichen is irregularly clumped across much of a downed branch, some areas have no soredia, some areas have densely packed apothecia, some have occasional soredia and one small patch had what looks like isidia. Multiple species? There goes another Saturday.
Thallus white-grey when dry, green when wet, pruinose at lobe tips, very pale below with dense black squarrose rhizines.
Apothecia with thick margin, variably pruinose, could be described as crenate, some apothecia (not photographed) sorediate or lobulate.
All spot tests negative.

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Used references: Nash V. 1

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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“Soredia” in Physconia
By: Jason Hollinger (jason)
2015-02-18 11:28:05 PST (-0800)

Are often blackened and granular and “isidioid” in appearance. The critical point is that P. elegantula is supposed to have “true isidia, the isidia typical and ±cylindrical, with a true cortex”. I’ve never seen it, but I’ve been assuming “it will be obvious when I finally see it”.

Created: 2015-02-14 16:49:40 PST (-0800)
Last modified: 2015-02-18 11:28:19 PST (-0800)
Viewed: 31 times, last viewed: 2016-10-21 22:25:03 PDT (-0700)
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