LICHENS OF SANTA CRUZ PENINSULA 375 



XIV. Ephebe Fries. 



Thallus fruticulose, branched, composed mainly of the alga 

 Sirosifhon fiilviualus associated with a fungus, the form and 

 habit of the plant being due mainly to the alga ; color black ; 

 apothecia immersed or superficial and globose; spores ellipsoid 

 or colorless. On rocks. 

 Efhche Fries, Syst. Orb. Veg. 256. 1825. 



I. EPHEBE PUBESCENS (L.) Fries. 



Thallus small, erect, tufted, minutely shrub-like, compact, 

 much branched, sooty black. Alga Sirosiphon. Sterile. 



Abundant on perpendicular sandstone rocks at several differ- 

 ent places in the Searsville ridge, at an altitude of about 400 

 feet. As yet not seen elsewhere. 



A very remarkable form unlike any other lichen of our flora. 

 Lichen piibcscens L. Sp. PI. 2: ii55' ^753' 

 Efhebefiibescens Fries, Fl. Scan. 294. 1835. 



XV. Collema Wigg. 



Thallus foliaceous, very small to medium size, very dark 

 green, or blackening ; cortical layer not present or indistinct; 

 apothecia scattered or crowded, usually numerous, very small 

 to medium size; spores ellipsoid, spindle-shaped or needle- 

 shaped ; 4-locular, plurilocular, and muriform ; colorless. 



On trees, earth, and rocks. 

 Collema Wigg. ; Weber, Prim. Fl. Hols. 89. 1780. 



KEY TO THE SPECIES. 



a. Confined to trees. 



b. Surface with anastomosing ridges covered by black granules. 



I. aggregatum, 376. 

 bb. Surface radiately wrinkled and pustulate. 



c. Surface, smooth, naked 2. vcspertilio^ 376. 



cc. Surface isidiose-pulvenilent 3. nigresce7ts^ 376. 



aa. Confined to earth and rocks. 



d. Thallus not sCjuamulose or crustaceous. 



e. Very gelatinous; on earth in damp places. 



f. Thallus rather large, smooth, more or less pustulate and 

 wrinkled; apothecia small 4. pulposiivi, 377. 



