THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 97 



asci with 8, rarely i6 spores; these from 3-to multilocular, spindle to 

 needle-shaped, with both ends ahke or one end prolonged into a tail, 

 straight, curved, or spiral, without a halo. 



A large genus, of more than 200 species, found all over the world, 

 on stones, bark, w^ood, moss, etc. 



KEY TO THE SPECIES. 



A. Thallus usually pale yellow, and yellow with KOH; apothecia blue, 



then violet with KOH i. herrei 



AA. Thallus never yellow and not changed by KOH. 



B. On rocks; thallus black with greenish or grayish cast 2. ioessa 



BB. On trees; thallus not blackish. 



C. Apothecia clouded flesh-color and darker; thecium blue with 



I 3. ncBgelii 



CC. Apothecia black; thecium not blue with 1 4. akompsa 



I. BACIDIA HERREI A. Zahlbr. 



Bacidia herrei A. Zahlbruckner, Annales Mycologoci, 6: 130. 1908. 



Thallus sub-orbiculate, becoming effuse, more or less chinky, of 

 granulose, densely imbricated and crowded, thickish squamules, or 

 thin and reduced to mere granules; without soredia or isidia, but the 

 granules sometimes almost coralloid; usually of a pale yellow color, 

 sometimes whitish, rarely greenish gray; KOH yellow; CaCl202 — . 



Apothecia sessile, small to medium, sparsely distributed to approxi- 

 mate, sometimes forming a heap of several together, basally con- 

 stricted, circular, or sub-angulose when crowded; disk plane to con- 

 vex, red, not pruinose; the proper margin thin, concolorous, entire, 

 from prominent finally excluded; with KOH an apothecial section 

 turns an intense deep blue, soon changing to violet, the epithecium 

 losing the blue last; epithecium granular, broad, dark red; hypothe- 

 cium colorless; hymenium more or less reddish, 90 — iio/i high, 

 bluish with I; paraphyses close together, free, simple, not septate; 

 asci short, oblong-clavate; spores arranged lengthwise in the asci, 

 colorless, needle-like to narrowly spindle-shaped, usually much 

 attenuated at one end, straight to slightly curved, indistinctly pluri- 



2 — 3 < 

 septate (5 — 8), ^/^> 35 ~ 40." longiseti.y — i.8«latis", A. 



Zahlbr. 



On sandstone and the bark of Pseudotsuga taxifolia and on dead 

 wood of Pseudotsuga taxifolia and Adenostomafasciculatum, at Devil's 



