Observation 103559: Arthonia albopulverea Nyl.

When: 2012-01-18

Collection location: Bluff Cove, Palos Verdes, Los Angeles Co., California, USA [Click for map]

33.7936° -118.4064° 26m

Who: Jason Hollinger (jason)

Specimen available

HABITAT chaparral on sea cliffs in small west-facing cove; SUBSTRATE Rhus limb; ASPECT shaded; NOTES very thin whitish crust, no algae, rather sharply raised black epruinose irregular stellate to polygonal apothecia, brownish epihymenium, abundantly fertile, spores 3-septate hyaline ~15 × 5 µm, asci with huge tip and large central plug extending down into interior all KI+ pale blue.


At 10x, stacked.
At 30x, stacked.

Proposed Names

-29% (1)
Recognized by sight
87% (1)
Eye3 Eyes3
Used references: det. by K. Knudsen

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
K. Knudsen looked at all of these Arthonia for me
By: Jason Hollinger (jason)
2012-08-19 03:03:21 EDT (-0400)

He also had trouble finding any mature spores free of the asci. He was finding spores with varying amounts of septation. But soon as he found some with 5 septae, it clinched it, as there are only a few other species in southern California with that. Fully mature spores should be submuriform with at least one longitudinal septum. Grube remarks in the Sonoran Flora about how variable this species is. Take a look at the variation in the apothecia of this thing:

observation 103549
observation 103559
observation 103551
observation 103591
observation 103595
observation 103598

Created: 2012-08-01 20:37:09 EDT (-0400)
Last modified: 2012-08-19 02:56:03 EDT (-0400)
Viewed: 23 times, last viewed: 2018-03-02 07:08:15 EST (-0500)
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