When: 2017-05-11

Collection location: Santa Barbara Co., California, USA [Click for map]

Who: J-Dar

Specimen available

Terricolous in coastal bluff scrub habitat, occurring in open bare patches between California sagebrush (Artemisia californica) shrubs).


Proposed Names

-28% (1)
Recognized by sight
28% (1)
Recognized by sight
57% (1)
Recognized by sight: Rhizines black, lower side of thallus black
28% (1)
Based on microscopic features

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= Observer’s choice
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Add Comment
By: J-Dar
2017-06-03 19:17:42 CEST (+0200)

Rhizines are branched and black. Dissection of the soil particles and rhizohyphae needs to be done very carefully to leave the rhizines in place, and thus observed. I did not confirm the carbonaceous outer layer of the rhizines, but in combination with the black lower cortex this seems the best ID, with E. loscosii still lesser possibility.

Updated micro
By: J-Dar
2017-06-03 16:01:45 CEST (+0200)

Thallus consists of brown, lobed squamules up 2-3 mm in size with ascending thickened margins. The lower surface is black. Attachment is by rhizohyphae with what appear to conform to “bundles” rather than true rhizines. These bundles look root-like, are weak, not black. Algal layer is uneven horizontally. Medulla white, Ascomata are subglobose perethecia, 0.2-0.3mm wide, embedded deeply in the laminal surface of the thallus, appearing as small raised black dots, and usually bulging the lower surface. In section the perethecia show thick black walls, 50-60µm wide, hyaline hymenium with round light green algal cells that are 3-7µm.

Spores 2 per ascus, muriform, hyaline to very lightly pigmented, large. 37.9×14.4, 33.8×17.2, 41.2×13.0µm

The spores are too large for Endocarpon pallidulum, which I though it was. I did not see any black rhizines, which E. pusillum has. E. loscosii should have a pale to darkening lower cortex, I saw it as black, but I’ll take another look. Height and type of asci are distinguishing characters I’ll have to go back and measure.

Created: 2017-05-29 15:59:09 CEST (+0200)
Last modified: 2017-06-03 19:18:21 CEST (+0200)
Viewed: 51 times, last viewed: 2019-08-13 06:50:05 CEST (+0200)
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