THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 47 



III. Endocarpon (Hedw.) A. Zahlbr. 



Endocarpon Hedwig, Descr. et Adumbr. Muse. 2 : 56, pi. 20. f. A. 1788. 

 Endocarpon A. Zahlbr., Ascolichenes, 61. 1907. 



Thai his of distinct squamules or leafy scales, closely adnate. 

 Apothecia solitary, much as in Dermatocarpon, but the hymenium 

 containing minute ellipsoid or circular green algae lying between the 

 asci; perithecium dark to black; paraphyses gelatinizing; asci saccate or 

 ventricose-clavate, with i 6 spores which are elongate or ellipsoid, 

 muriform-multilocular, from colorless becoming yellowish and dark 

 brown. 



Species few, widely distributed on earth and rocks. 



KEY TO SPECIES. 



Squamules flat, closely adnate ........................ i. pusillum 



Squamules overlapping, with upturned margins ........ 2. pallidum 



Thallus with rounded or incised lobules more or less complicate-imbricate. 



3. puhinatum 



i. ENDOCARPON PUSILLUM Hedwig. 



Endocarpon pusillum Hedwig, Descri. et Adumbr. Muse. 2 : 56, pi. 20, 



f. 8, 1788; Germany. 



Thallus of small to minute squamules, more or less scattered, or 

 occasionally forming a crust; flat, closely adnate, circular or with 

 crenate or lobate margin; surface smooth or flexuous; color passing 

 from reddish brown to blackish brown; KOH ; CaCl 2 O 2 . 



Apothecia small, immersed, rather numerous, the minute ostiolum 

 at length enlarged and pit-like; perithecium dark brown, entire; 

 spores 2, one usually larger than the other, at length dark brown, 



Common on crumbly sandstone in the foothills, either alone or 

 upon a cushion of Scytonema filaments, which also often grow over 

 the thallus. Probably occurring all through the mountains wherever 

 there is sufficient rock exposure. 



Recorded from Europe, North America, Algeria, and New Zealand. 



