On California bay (Umbellularia californica), where it was common at this location, on the ridge of the Santa Lucia Range above Cayucos.

Thallus thin, greenish. Apothecia purplish (when wet), plane with raised rim to convex with weak or lacking margin. Epihymenium violet, with weak POL+ crystals, hymenium hyaline, hypothecium yellowish, intensifying in K. Paraphyses long and slender, simple to rarely branched near tip, apical cell clavate, hyaline. Exciple lacking algae, POL+ fine white crystals, with enlarged cells on outer edge.

Spores 8 per ascus, not spirally coiled. Ascus clavate, with K/I + solid blue tholus. Size variable, larger ones 65×4, most 14+ septate, fusiform to acicular with one blunt and one pointed end, occasionally with two pointed ends, straight to weakly curved or sigmoid.

See also observation 278496 for another similar observation.


100x in water
100x cross polarized (POL)
Exciple in water at 400×.
Note intensifying yellow hypothecium in KOH
K/I stain
K/I stain
100x in water
100x cross-polarized
400x in water
100x in KOH
100x POL in KOH
Exciple at 400x in KOH
Note margins are glossy

Proposed Names

28% (1)
Based on microscopic features: Spores 14+ septate

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= Observer’s choice
= Current consensus


Add Comment
Updated Identification
By: J-Dar
2019-03-16 13:32:58 EDT (-0400)

Not sure why I dismissed Bacidia laurocerasi in the first place, i think because spores were described as at times sigmoid and I characterized these as straight, but they are variable from straight to sigmoid. Key characters:

*Upper part of hymenium not green or blue-green, not K+green; rather its dark
brown and K+purplish
*Spores acicular, >3µm wide, mostly >14-septate, straight to sigmoid, not
*Hypothecium pale yellow, intensifying in K
*Apothecial disk color reddish-brown, rims lighter, glossy at least when young
*Amphithecial rim concolorous with disk at top (clear below), brown pigments
*Thallus not granular; rather its continuous to rimose-areolate
*Outermost exciple 1-2 cells enlarged
*Apothecia epruinose
*Epithecial pigments in matrix between paraphyses caps (as far as I can tell)

Subspecies idahoensis is the western counterpart, with lighter colored apothecial rims.

Another look, still can’t get to Bacidina
By: J-Dar
2019-03-09 14:40:13 EST (-0500)

But I have this gut feeling it should go to Bacidina californica. The exciple characteristics and many septate spores seem to put it in Badicia proper.

3/1/19: Thallus green, continuous, cracked to flaking, somewhat granular. Apothecia pinkish, pallid when very young, proper margin raised, lighter than disk, becoming mostly excluded when disk convex. Exciple width 50µm. Hymenium 80-85µm tall. Hymenium and exciple without brown pigments, K-. Epithecium violet in water. Hypothecium yellowish. Exciple lateral interior yellow, extending down into medullary part, POL+fine white crystals. Paraphyses without pigmented caps.