70 HERRE 



Color varying from yellowish or brownish yellow to a dingy ashy 

 gray, the last most common; KOH ; CaCl 2 2 . 



Apothecia numerous, of medium size, rounded elevated, sessile; 

 surface of disk minutely granular, ashy-gray pruinose; the thalline 

 margin thick, prominent, white, obtuse, soon flexuous, often intri- 

 cately so; epithecium dark, 56^ high; hypothecium black, thick, 140^ 

 high, blue or bluish with I; paraphyses typical, thecium wine-red 



70 134.5 

 with I; asci clavate, straight or curved, long stalked, l6 g _ 22 4 P> 



spores fusiform, straight or slightly curved, quadrilocular, 

 5-8.5 



23.8-33.5 ^ 



On rocks 50 to 75 feet above the sea at Point Lobos, San Fran- 

 cisco, growing with Dendrographa minor. 



Near Dirina repanda of Europe and Northern Africa, but with a 

 thicker and differently colored thallus and with different spores. 



ROCCELLACE^E. 



Thallus fruticose, erect or decumbent, attached to the substratum 

 by a holdfast; with distinct cortex and medulla; alga Trentepohlia. 

 Apothecia circular and linear, innate or sessile. 



A maritime family, on trees and rocks, mostly found on tropical 

 coasts. Some species furnish a valuable dye. 



XVI. Dendrographa Darb. 



Dendrographa Darbishire, Ber. der Deutsch. Bot. Gesellsch. 13: 313. 



1895; Monograph. Roccell., Bibliotheca Botanica, 45: 1898. 



Thallus erect or decumbent, tufted or matted; filaments terete or 

 compressed basally, branched, with infrequent lateral soredia; color 

 gray. Apothecia lateral, circular, the disk black, white pruinose; 

 spores quadrilocular, colorless, spindle-shaped or slightly curved. 



On maritime shrubs or on rocks and earth, on the coast of Cali- 

 fornia. 



