LICHENS OF SANTA CRUZ PENINSULA 37 1 



On trees and shrubs ; commonest on Rhus divcrsi'loha. 



Apparently confined to damp undergrowth in oak woods about 

 the summit of the range. Abundant on Black Mountain, Page 

 Mill road, at 2000 feet. 

 Ncpi7'omiiim to7nentosum subspecies ramcum^ Nyl. Norrl. Med. 



Silllsk. Faun, et Flor. Fenn. i : 18. 1876. 

 Ncfhroma ramciun Schaerer, Enumerat. Crit. 18,//. 2^/.j. 



1850. 



2. NEPHROMIUM HELVETICUM Acharius. 



Thallus small or medium, expanded, intricately and sinuously 

 complicate-lobed ; lobes rounded, more or less crisped, their 

 margins crenate, typically fringed with small or minute tooth- 

 like lobules ; surface smooth or minutely granular, but occa- 

 sionally sprinkled with pustules or lobulate outgrow^ths ; some- 

 times deeply pitted : medullary layer white ; beneath pale brown 

 to dusky, covered with a dense concolorous nap ; color brown, 

 of varying shades. Apothecia abundant, very dark red. 



On trees and shrubs in the mountains, above 1700 feet. 



Apparently confined to dense damp woods near the summit of 

 the range ; widely distributed but not ver}- abundant at any one 

 locality. 



Nephroma helvetica Ach. Lich. Univ. 523. iSio. 

 Nephroma helveticum Tuck. Syn. N. Am. Lich. i : 104. 1882. 



3. NEPHROMIUM LUSITANICUM (Schaer.) Nyl. 



Thallus expanded, rounded ; of medium size but becoming 

 rather large by the coalescence of adjacent plants ; deeply^ and 

 sinuately imbricate-lobed ; lobes crenate at tip, their margins 

 sometimes minutely crenate or notched, when they simulate the 

 denticulate margins of Nefhromhim helveticum. Surface 

 smooth, becoming more or less wrinkled ; color varying from 

 drab and pale browai to dark chestnut ; beneath smooth, more 

 or less wrinkled ; pale brown, becoming dusky and finally 

 black : medullary layer yellow. Apothecia numerous, medium 

 to large. 



Very abundant on mossy sandstone and trunks of oaks in 

 Devils Canon, at an altitude of 2300 feet. Not found as yet 



