When: 2008-03-06

Collection location: Edgewood Blue, Wells Gray region, British Columbia, Canada [Click for map]

Who: Jason Hollinger (jason)

Specimen available

crustose lichen, on rain-sheltered Abies twig
THALLUS: mound of rough medium-gray-green stuff
APOTHECIA: tiny white disks, 0.1-0.2 mm, thin white dusty pruina, v convex, prominant rim when young, epihymenium brownish with pruina of minute POL+ white crystals (clears in K), hymenium clear (K/I+ blue), hypothecium clear, algae thick bel apothecium, ascus tip K/I+ blue with v fine thin lighter axial mass perhaps flaring abruptly at outside, paraphyses K/I+ gold, unbranched, expanding to rather thick tips (2-2.5 µm)
SPORES: 8 per ascus, 1- to mostly 3-septate, long elliptical, 10.6+/-0.8 × 2.6/-0.3 µm (Q=4.1/-0.6) (N=7), K/I+ gold, septae v weak and lost in inner texture, outside smooth

Used Curtis’s keys and American Arctic Lichens, Vol. 2, Thomson, 1997. They bring me to Biatora pallens and Bacidia pallens respectively. Curtis tells me it’s actually Cliostomum pallens(!!).


Apothecia, at 30×.
Apothecial section, in water, at 400×.
Ascus with spores, in K/I, at 1000×.

Proposed Names

87% (1)
Used references: Curtis Bjork’s provisional keys to te epiphytic crustose lichens of BC.
American Arctic Lichens, Vol. 2, Thomson, 1997.
Based on microscopic features

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
No one has commented yet.