Observation 67191: Peltigera rufescens (Weiss) Humb.
When: 2011-05-10
(48.65371° -118.674962° )
No herbarium specimen

Notes: found intergrowing with moss on the northern facing side of a railroad cut.

Proposed Names

54% (2)
Recognized by sight
56% (1)
Recognized by sight: densely tomentose with ascending (not down-turned) margins

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Two similar Peltigera species
By: Jason Hollinger (jason)
2011-05-10 18:08:11 PDT (-0700)

Both P. rufescens and P. ponojensis look very similar, grow in similar habitats, and I’m not qualified to distinguish the two reliably from above. The underside is the key:

P. rufescens — veins very low and indistinct, turning dark brown/gray/black abruptly toward center of thallus, rhizines bushy and typically coalescing into a matt

P. ponojensis — veins more distinct and “ropy”, typically pale throughout though sometimes darkening gradually toward center, rhizines distinct to brush-like to occasionally bushy but never coalescing into a matt

Amazingly, it’s looking very much like the two species are unrelated taxonomically speaking. But to the field naturalist, they will continue to form a useful species-pair.

Created: 2011-05-10 17:45:18 PDT (-0700)
Last modified: 2011-05-10 18:01:55 PDT (-0700)
Viewed: 31 times, last viewed: 2016-10-28 07:30:20 PDT (-0700)
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