Observation 13103: Pertusaria xanthodes
When: 2007-01-16
No herbarium specimen

Notes: Crust lichen, on bark.
THALLUS: dull rimose yellowish, not too thick, cortex not very distinct from medulla, K+ very faint yellow (visible under 30x), KC+ orange (visible under 30x), C+ fleeting orange (very strong on epihymenium)
MEDULLA: can’t distinguish from cortex
ALGAE: green
APOTHECIA: disks buried in smooth-sided warts
SPORES: huge, 2 per ascus, elliptical-oblong, 125 × 40 µm, outer wall 4 µm, inner wall 4 µm, one end has very thin outer wall, conspicuously radially striate, inner wall conspicuously rough

There are four poriform, esorediate, 2-spored Pertusaria listed for the area in Nash, two of which have the C+ orange reaction. The other one, P. pustulata, has smooth inner spore wall and dark epithecium, this one, P. xanthodes has rough inner spore wall and pale epithecium.

Images

26772
Thallus at 30×.
26771
Thallus at 10×.
26773
Spore in water at 1000×.
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Spore in water at 1000×.

Proposed Names

87% (1)
Eye3 Eyes3
Used references: Nash’s Sonoran Flora
Based on microscopic features: large spore with rough inner wall
Based on chemical features: K+ yellow, KC+ orange

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2008-10-25 20:36:53 PDT (-0700)
Last modified: 2008-10-25 20:36:53 PDT (-0700)
Viewed: 28 times, last viewed: 2016-03-20 18:40:18 PDT (-0700)