Observation 197619: Physconia isidiigera (Zahlbr.) Essl.

When: 2015-01-31

Collection location: Atascadero, California, USA [Click for map]

35.4514° -120.6437° 280m

Who: J-Dar

No specimen available

Notes:
On Sambucus nigra ssp. caerulea (Blue Elderberry, formerly S. mexicana). I think also on nearby oaks, but I’ll post that separately.

Irregularly shaped, abundant on trunk and small branches. Thallus upper surface pruinose, greyish white, lower surface light brown, pale white at lobe margins. Rhizines dense, black, squarrose, with occasional long simple clear/white ones. Apothecia uncommon on most specimens but occasionally abundant. Spot test K-.

Two specimens photographed in situ, one piece shot under microscope.

Images

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Pruina on lobes
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Squarrose rhizines

Proposed Names

76% (2)
Eye3 Eyes3
Used references: Nash V.1 and CNALH website
Based on chemical features: K-

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2015-01-31 23:38:11 CST (-0500)
Last modified: 2015-02-01 00:51:17 CST (-0500)
Viewed: 29 times, last viewed: 2018-04-24 11:40:56 CDT (-0400)
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