Observation 87615: Lecania fructigena Zahlbr.
When: 2012-01-18
(33.797° -118.4079° )
Herbarium specimen reported

Notes: Growing abundantly on some sort of siliceous (HCl-) rock about 20-30 feet above spray zone on sea-cliffs of Bluff Cove with northern/western exposure. Thallus particularly thickly bullate to almost subfruticose crust. Appears brown from a distance, but is actually grayish up close.

Epihymenium brown; hymenium hyaline; hypothecium hyalin; all parts POL- except for layer of POL+ granules between hypothecium and algal layer; algal layer continuous below; all parts K- C- KC- UV- (350nm).

Pycnidia immersed and inconspicuous in verrucae; conidia filiform 15-16 × 1 µm.

Spores oblong to ellipsoid; hyaline; septate but very hard to see even in K and/or I; 10-15 × 3-4 µm.

I used the Sonoran Flora (vol 2). I’m thinking that this thallus is what van den Boom and Ryan describe as “papillate, the papillae constricted at base or bullate-areolate to subsquamulose… at least some main thallus subunits convex and constricted at the base”. There are several species all with similar microscopic and chemical characteristics, so it seems it’s important to understand these vague morphological descriptions.

If I’m wrong, then this must simply be “verrucose” (I refuse to call this squamulose to subsquamulose) and the key leads straight to L. subdispersa (= L. franciscana), but see my next observation 87617. It would seem to match the description there much better.



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Created: 2012-02-10 15:51:59 PST (-0800)
Last modified: 2012-02-10 16:03:20 PST (-0800)
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