THE LICHEN FLOILV OF THE SANTA CRUZ PENINSULA 5 1 



DIDYMELLA FALLAX Wainio. 



Artho pyrenia fallax Nyl. Flora, 363. 1872. 



This fungus, long considered to be a lichen, but which is apparently 

 not a lichen as it seems to lack alga?, is common on the trunks and 

 limbs of smooth-barked trees in the foothills. It may be recognized 

 as follows: Thallus thin, rather effuse, forming smooth, whitish, 

 cream-colored or pale olive patches; sprinkled with the minute, black, 

 sub-globose, sessile or half-innate apothecia; paraphyses hair-like, 

 free, simple and straight or branched and more or less twining; I — ; 

 asci elongate, brownish with I; spores bilocular or becoming 4-locular, 



cons'ricted at the middle, ^^^^^ ^^fi . 



12^ — 20 



4. ARTHOPYRENIA CINEREO-PRUINOSA (Schaer.) Jatta. 



Verrucaria cinereo-pruinosa Schaerer, Spicilegia, 342. 1836. 

 Artho pyrenia cviereo-pruinosa Jatta, S\ll. Lich. Ital. 529. 1900. 



Thallus diffuse, thin, uniform, pale gray to olivaceous; KOH yellow; 

 CaCl202 — . 



Apothecia scattered, black, small to minute, more or less immersed 

 and sessile, hemispherical or sub-globose; covered with the epidermal 

 thalline layer, and hence ashy-pruinose, or naked; perithecium dimi- 

 diate, black, thickish; paraphyses branched and twining, or simple; 



I — ; spores bilocular, pointed and slender ellipsoid, ^? — ji- 



12 - 15 



On the bark of Umbellularia californica, in Stevens Creek Cafion. 



The above seems to be a variety of this European lichen, characterized 



by mailer spores than the type. 



Section ACROCORDIA. 



Apothecia solitary, hemispherical, globular, or conical; paraphyses 

 permanent, hair-like, twining and net-like; asci cylindrical or ventri- 

 cose, the spores of 2 similar cells arranged in a single row. 



