344 Herre 



Creek, at an altitude of looo feet. Very abundant and con- 

 spicuous on Pinus radiata at Pacific Grove, Monterey Bay. 

 Should be carefully looked for along the coast between Santa 

 Cruz and Pescadero. 



A very handsome lichen. 

 Usnea Jlorida nibtginea Michx. Fl. Bor. Am. 2: 332. 1803. 



4. USNEA CERATINA Acharius. 



Thallus fruticose, much branched, at first erect but becoming 

 pendulous ; reaching a length of 6-8 inches or perhaps more ; 

 thickly covered with long slender curling fibrils ; epidermis 

 smooth to warty or papillose. Apothecia abundant, medium to 

 large ; concolorous, tan, or very pale flesh-color. 



On trees and dead wood. Abundant at 2000 feet and above. 



Specimens collected by Dr. Peirce on the La Honda grade 

 were identified by A. B. Seymour of Harvard University. 

 Specimens collected at Castle Rock and elsewhere identified by 

 the author; for lack of time not submitted to Dr. Zahlbruckner. 

 Usnea ceratina Ach. Lich. Univ., 619. 1810. 



5. USNEA DASYPOGA (Ach.) Nyl. 



Thallus greatly elongated and pendulous, slender, terete ; 

 thickly beset with short spreading fibrils ; epidermis usually 

 smooth or minutely roughened ; color gray or yellowish green 

 (straw-color) ; the principal branches often blackening basally. 

 Apothecia small, infrequent, rather pale. 



Common on trees and shrubs above 600 feet ; best developed 

 in the redwood formation, often reaching a length of four feet. 

 Usnea flicata dasyfoga Ach. Meth. Lich. 312. 1803. 

 Usnea dasypoga Nyl. St. Gall. Nat. Ges. 202. 1876. 



6. USNEA PLICATA (Ach.) Nyl. 



Thallus greatly elongated and pendulous, rather coarser than 

 Usnea dasypoga; sub-dichotomously divided, the branches 

 without spreading fibrils ; varying from gray-green to straw- 

 color. Apothecia very small, rare. 



Frequent on trees and shrubs above 600 feet altitude. Often 

 growing in inextricable confusion with Usnca dasypoga. 

 Lichen pi icatus Kch.. Prodr. 225. 1798. 

 Usnca plicata Nyl. Flora, 68: 299. 1885. 



