HASSE—LICHEN FLORA OF SOUTHERN CALIFORNIA. 105 
On limbs of conifers in the Tehachapi, San Gabriel, and San Jacinto ranges. 
Morthern United States to arctic America; Europe; mountains of northern and 
piiddle Asia; Auckland and New Zealand. 
The variety chlorophana Wahlenb. (Santa Cruz Mountains, Herre), has not been re- 
ported from our district. 
USNEACEAE. 
Thallus fruticulose, erect to pendulous and elongate-pendulous, terete, terete- 
compressed, and foliaceous-compressed, corticate throughout, affixed to the sub- 
stratum by a common basal plate; apothecia circular, shield or dish-shaped, lecanorine; 
spores from solitary to 8, colorless, simple or bilocular in our species; gonidia Pro- 
tococcus. 
KEY TO GENERA. 
Spores bilocular; thallus light straw or pale greenish, compressed- 
foliaceous or terete-compressed.........-------+-----+---- RaMA.ina (p. 105). 
Spores simple. 
Thallus brown to black.............---------------- 225-5 AxecToria (p. 109). 
Thallus of some lighter color. 
Thallus rich yellow......-- Lee ee eee eee cece cece ee eee LeTHaRIA (p. 110). 
Thallus pale greenish. 
Compressed, linear, sterile with us.....-.-.-------. Evernta (p. 109). 
Terete.....-.-..0.0---- 2-22 cece eee eee wee eeeeeee UsneEa (p. 108). 
RAMALINA Ach. 
Thallus fruticulose, erect or pendulous, affixed by a basal plate to the substratum, 
‘yranching, seldom nearly foliaceous, terete or subcompressed, corticate throughout; 
zonidia Protococcus; soredia not rare; apothecia terminal or lateral, cup-shaped or 
shield-shaped, lecanorine; spores 8, colorless, oblong, ellipsoid to fusiform, straight 
or lightly curved, bilocular, rarely quadrilocular; sterigma sparingly branched; 
spermatia short, straight. 
KEY TO SPECIES. 
Lacinie long-pendulous, fenestrate. .....--..-----------+-++++- 11. R. reticulata. 
Laciniz erect or nearly so. 
Terete or subcompressed. 
Apothecia lateral.............+++-++-22-0--05-2 errr eee 1. R. ceruchis. 
Apothecia terminal or subtermimal.........----------- 2. R. combeoides. 
Compressed. 
Rigid....... 2.22.2. 0222 eee eee eee cee eee eee 3. R. homalea. 
Not rigid. 
Linear-elongate. 
Canaliculate........--------------+-+---+--° 4. R. canaliculata. 
Not canaliculate, flat. 
Margins of laciniz sorediate........------ 6. R. farinacea. 
Margins not sorediate....-....----------- 5. R. fraxinea, 
Beset with black fibrils. ...........-- 9. R. crinita. 
Not beset with fibrils. 
Irregularly branching; apothecia 
marginal...........-.------ 10. R. menziesit. 
Branching at base, furcate at tips; 
apothecia lateral........- .. 8. R. yemensis. 
Not linear-elongate, dilated, lacerate, and sorediate 
above. 
Low, not over 2 cm. high.....-.-.----------- 7. R. pollinaria. 
Taller, 4 to5 cm. high.......-...---------+++ 12. R. evernioides. 
