I36 HERRE 



late or crenate; surface radiately ridged and pustulate, finally densely 

 isidiose pulverulent; color very dark green or blackish green; beneath 

 concolorous or paler, lacunose, pitted, or fenestrate. 



Apothecia usually infrequent and scattered, rarely numerous, 

 small to medium ; the disk dark red-brown ; the entire margin rather 

 thick, finally excluded; often isidiose, when it is tuberculate-radiate 

 or toothed. Spores acicular or long-fusiform, more or less curved, 



5-6 locular, ~ ^ fi. 



39 - 49 

 Fairly common on trees in the foothills, A wide spread, probably 



cosmopoHtan lichen, 



4. COLLEMA CRISTATELLUM Tuck. 



Collema cristatellum Tuckerman, Lich. CaHf. 29. 1866. 

 Collema cristatellum Tuck. Syn. N. Am. Lich. I: 152. 1882. 

 Collema cristatellum Herre, Proc. Wash. Acad. Sci. 7: 378. 1906. 



Thallus scattered, microscopic, forming an indeterminate crus- 

 taceous or squamulose crust; lobes minute, ascendant, with more or 

 less dissected and crenate or dentate edges, or reduced to tiny erect 

 lobules; color greenish or brownish black. 



Apothecia of medium size, concave; disk concolorous or reddish; 

 margin entire; spores from bilocular and spindle-shaped becoming 



muriform and oblong or ellipsoid, ^ fJ-', according to Tuck., 



22 — 31 

 7-9 



16-30 



On clay and crumbhng rock on a steep slope in Hidden Villa 

 Canon, elevation 800 feet. Probably occurring throughout in simi- 

 lar situations but too readily overlooked. 



Only recorded so far from New Mexico and California. 



5. COLLEMA COCCOPHORUM Tuck. 



Collema coccophorum Tuck. Proc. Am. Acad. Arts and Sci. Vol. 

 Collema coccophorum Tuck. Syn. N. Am. Lich. I: 150. 1882. 

 Collema coccophorum Hasse, Bull. So. CaUf. Acad. Sci. 5: 38. 1906. 

 Thallus small, effuse to orbicular, black or very dark; the tiny 

 lobules more or less erect, imbricate or complicate, the free end 

 enlarged, crenate or densely tuberculate. 



