THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA l3l 



Apothecia sessile, scattered or terminal, biatorine, the disk flat or 

 slightly convex; paraphyses simple, with the tips septate and some- 

 what enlarged; spores colorless, boat or spindle-shaped, bilocular. 



We have two of the 3 or 4 species. 



KEY TO SPECIES. 



A. Thallus foliaceous, under margin with conspicuous, white, fleecy cilia. 



I. albociliatum 

 A A. Thallus minutely fruticulose, irregularly and intricately branched. 



2. muscicola 



I. POLYCHIDIUM ALBOCILIATUM (Desmaz.) A. Zahlbr. 



Leptogium albociliatum Desmazieres, Ann. Sci. Nat. 4:4. 132. 1855. 



Leptogiufn albociliatum Tuck. Syn. N. Am. Lich. I: 156. 1882. 



Leptogium albociliatum Herre, Proc. Wash. Acad. Sci. 7: 380. 1906. 



Polychidimn albociliatum A. Zahlbruckner, AscoHchenes, 157. 1907. 



Thallus small to medium size, rounded, by coalescence forming 

 extensive, indeterminate mats; lobes imbricate, deeply and sinuately 

 laciniate, their tips rounded or pointed; margin in folds or crisped, 

 up-turned, crenate, lacerate, or denticulate; surface smooth cen- 

 trally, often granulate or with small erect lobules; color greenish 

 black; the margin cilia te with minute white bristles; under surface 

 paler; marginally with a conspicuous white fleece; this longer, shaggy, 

 and brown within; rarely disappearing. 



Apothecia numerous and becoming crowded when present; small 

 to medium size, sessile; disk reddish, plane or convex; margin pale, 

 entire, finally disappearing; often bristly with minute white cilia 

 similar to those on margin of thallus. Spores bilocular, pointed, 



slightly constricted in the middle, — ^^^ ^^-^ M- 



19.5 - 28 



Found throughout on rocks and on earth, among mosses. 



Fruiting abundantly at 3000 feet altitude on Castle Rock ridge 

 and in Devils Caiion, at 2300 feet; still luxuriant in growth as low as 

 2000 feet. Extending downward to 150 feet in the foothills, but 

 there reduced and sterile. 



A European lichen, recorded in this country only from the Pacific 

 slope. 



