THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 213 



lous; branches terete, basally angular; large specimens conspicuously 

 angular and lacunose; whole plant a bright lemon-color, often more 

 or less sorediate; very small immature specimens sometimes of a yel- 

 lowish green. 



Apothecia large, in specimen from San Bernardino Mts. an inch 

 and a half in diameter; terminal, more or less pedicellate; disk chest- 

 nut; margin often fringed with large fibrils, otherwise smooth and 

 entire; spores (taken from specimen collected on Mt. San Bernar- 

 dino, altitude 6000 feet) ellipsoid, fci^. 



7- ii 



On trees, old fences, and sandstone. 



Occurring everywhere on the peninsula; small, inconspicuous 

 specimens are found on old fences and roofs from the salt marshes 

 about San Francisco Bay to the summit of the range. Common on 

 trunks and limbs of Sequoia sempervirens and Pseudotsuga taxifolia, 

 especially on dead or dying limbs. Common on sandstone above 

 2300 feet. 



But one fertile specimen collected within our limits, on an old 

 fence near Stanford University, at an altitude of 200 feet. 



In the higher mountains of the state everywhere abundant, form- 

 ing huge matted yellow clumps 6 inches or more in length, the large, 

 fibrillose apothecia and brilliant thallus attracting the attention of 

 all. 



A lichen of arctic and alpine Europe and North America, and of 

 the high mountains west of the Missouri; in this state ranging south 

 into Lower California. 



LIV. Alectoria Ach. 

 Alectoria Ach. Lich. Univ. 120. 1810. 



Thallus pendulous or prostrate, attached by a holdfast, usually 

 excessively elongated for its diameter and resembling fine hair; the 

 cortex of longitudinal hyphae; medulla of longitudinal hyphae form- 

 ing a cottony central cord. 



Apothecia on short, crooked, lateral branchlets, sessile or sub-pedi- 

 cellate, with naked or ciliate margin; disk brown or blackish; hypo- 

 thecium colorless, upon an algal layer; paraphyses branched and 

 anastomosing; asci with 4-8 spores, these simple, ellipsoid, colorless 

 or brownish. 



