THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 7 I 



I. DENDROGRAPHA MINOR (Tuck.) Darb. 



Roccella leucophcea var. minor Tuck., 



Dendrographa minor Darbishire, Ber. der Deutsch. Bot. Gesellsch. 



16: 13. 1898. 

 Dendrographa minor Herre, Proc. Wash. Acad. Sci. 7: 393. 1906. 



Thallus erect or more often lax and decumbent, tufted; terete 

 and hair-like or slightly flattened below, much and intricately 

 branched, forming dense tangled clumps; color gray, or basally 

 blackening. Sterile. Large globose lateral soredia sparingly pres- 

 ent, these apparently taking the place of apothecia. 



Abundant on rocks and earth 50 to 100 feet above the sea near 

 Golden Gate, San Francisco; collected on rocks at Mission Dolores 

 by Bolander, but now extinct there. Fertile specimens collected 

 on rocks at Monterey by Dr. W. G. Farlow, in 1885. On high bluffs 

 at Tomales Bay, Marin County, Bolander in Tuck. Herb. Re- 

 corded from the islands of Lower CaHfornia by Dr. Hasse. 



Specimens in the Tuck. Herbarium are marked "A R. leucophcea 

 vix diver sa." 



CYCLOCARPINEiE. 



Thallus from the simplest uniform crust to the highest foliaceous 

 or fruticose form; in the crustaceous forms fastened to the substra- 

 tum by the hj^Dhse of the h^^othallus or the medulla, in the other 

 forms usually by rhizoids, holdfasts, or an umbiHcus. Cortex absent 

 in most crustaceous forms, or variously developed, on the upper 

 side or on both sides. Algas of various families, Protococcus, Pleiiro- 

 coccus, Palmella, Trenlepohlia, Gloeocapsa, Nostoc, Scytonema, Stig- 

 onema, Calothrix and Rivularia. 



The apothecia are usually disk, shield, or plate-like; sometimes 

 they are urn-like or globose with a very narrow or minute disk and 

 immersed in the thallus so that they resemble the Pyrenocarpeae. 

 The apothecia vary from innate and sessile to stalked, in some forms 

 the stalk resembling a fruticose thallus, the podetia of authors. 

 A proper margin usually evident, sometimes lacking; when formed 

 of hyphai which enclose no algae, soft and nearly or quite colorless, 

 it is biatorine; when formed of the thallus, black and coal-Hke, it is 

 lecideine; when formed of the thallus and enclosing algas, it is lecan- 

 orine. Hjpothecium variously colored, clear to black; paraphyses 



