242 HERRE 



or dusky hypothallus, uniform, from thin and rather smooth becom- 

 ing thick, minutely fissured and rough-warty or uneven; color a yel- 

 lowish-green or whitish-greenish; KOH greenish yellow; CaCl202 

 yellow. 



Apothecia small to medium, finally large, scattered, sessile, dull 

 black; the disk at first concave, then plane, at last convex, the entire 

 margin finally excluded; epithecium granulose, brown to dark 

 brown; hypothecium brownish black; paraphyses simple, threadlike, 

 lax, their tips very slightly enlarged and brown-margined; asci with 

 1,2,3 ^^^ 4 spores; thecium blue with I; spores very diverse, at first 

 bilocular, then quadrilocular, finally becoming muriform multi- 



lA — l8 . I C 22 



locular, M in a specimen from Pimis radiata, r- « 



'29—45 ^ '40 — 60 



in a specimen from an old fence near San Francisco Bay. 



On the bark of Pinus radiata at the mouth of Ano Nuevo Creek 



and southward along the coast on old fences and various trees; 



also on an old fence on the salt marsh near Mountainview Landing. 



Recorded byTuckerman as occuringon the bark of various trees, in 



a number of localities, from San Diego and Yosemite to the state of 



Washington. 



18 — 24 



Accordmg to Tuckerman the spores occur solitary, -7 ^ /< and 



40 — 00 



also in twos, threes, fours, fives, sixes and eights, averaging 16 

 by 30//. As Tuckerman well says "This instructive lichen beauti- 

 fully exhibits the history of the muriform spore. " 



5. BUELLIA HALONIA (Ach.) Tuck. 



Lecidea halonia Ach. Meth. Lich. 47. 1803. 

 Buellia halonia Tuck. Lich. Calif. 26. 1866. 

 Buellia halonia Tuck. Gen. Lich. 186. 1872. 

 Buellia halonia Tuck. Syn. N. Am. Lich. II: 95. 1888. 



Thallus determinate and more or less orbiculate, or even sub- 

 effigurate, upon a black, Hmiting hypothallus; made up of tiny, 

 angular areoles separated by minute to medium-sized chinks or fis- 

 sures, at first smooth but soon wavy or variously rugose ; color a 

 pale yellow-green to bright greenish yellow; KOH— ; bright orange- 

 red with CaCl202. 



