THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 137 



Apothecia very rare, small to medium size, the disk flat, reddish 

 brown; the entire margin upturned and prominent, thin, and becom- 

 ing minutely denticulate; spores ovoid, bilocular, /*; 



12 - 14.5 



Tuckerman says " spores ovoid-ellipsoid, bilocular, mostly decolo- 



II - 21 " 



rate, - - P* 



7 ~ 9 



On earth on dry hillsides or in rock crevices, usually growing with 

 Nostoc commune and Dermatocarpon hepaticum. Not abundant any- 

 where, but generally distributdd in the foothills. 



Recorded by Tuckerman from the valley of the Rio Grande, 

 Texas, and from Oakland, California. Dr. Hasse has also found it 

 in Riverside and Los Angeles counties, California, and it probably 

 occurs generally throughout the southwestern states. 



6. COLLEMA PULPOSUM (Bernh.) Ach. 



Lichen pulposus Bernhardi, in Schrader's Journ. Bot. 1: 7, pi. i,/. 



i. 1799. 



Collema pulposum Ach. Lich. Univ. 632. 1810. 

 Collema pulposum Tuck. Syn. N. Am. Lich. I: 148. 1882. 

 Collema pulposum Herre, Proc. Wash. Acad. Sci. 7: 377. 1906. 



Thallus thin, small to medium size, orbicular or irregular, closely 

 appressed, usually depressed or concave centrally; very soft and gela- 

 tinous when moist; lobes rounded, sometimes imbricate, margin 

 varying from entire and sinuous to crenate and slightly laciniate and 

 even denticulate; surface smooth, more or less pustulate and 

 wrinkled; sometimes beset with tiny erect lobules; color dark green 

 or black, sometimes brownish; beneath paler, smooth, wrinkled. 



Apothecia small, numerous; disk flat or concave, reddish, with 

 paler, entire margin; spores more or less pointed., ellipsoid or ovoid, 

 often slightly curved, from 4 locular becoming muriform, 



- ; /*; according to Nylander, whose measurements are copied 

 20 30 



by all later writers, they are -~ /*. 



16 24 



On earth on damp hillsides, forming rather extensive patches 

 among mosses. Not rare in the foothills and lower slopes of the 

 mountains. Found throughout the northern hemisphere. 



