SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. 23 



Contributions to the Lichen-flora of the Cali- 

 fornian Coast Islands. 



BY DR. H. E. HASSE. 



While the Phaenerogams of these islands have been pretty 

 thoroughly canvassed by visiting botanists, scant notice or none 

 has been given the lowly but interesting class of lichens, and 

 thanks are due Mrs. Blanche Trask for having made some col- 

 lections, although it is to be regretted that the matter gleaned 

 during several trips has not been more extensive. 



To make this list collective of the known insular lichens, 

 some of the species previously reported (Erythea 1895, Torre y 

 BoT. Club I^ich. So. Cal. 1898), are re-entered here. Except- 

 ing species found upon Catalina by the writer, the collectors are 

 mentioned. 



Cladonia pyxidata chlorophaea, Floerk. Catalina. 

 " fimbriata tubaeformis, Fr. " 



Subspec. C. fibula, Nyl. Catalina. 

 " furcata corymbosa, Nyl. Catalina. 

 Dendrographa leucophaea (Tuck.) Darbish. San Miguel and San 



Nicholas Islands. (Trask.) 

 Roccella fuciformis (L.) Ach, Catalina. (Trask.) 

 " ceruchis Ach. Catalina. (Trask.) 



f. cephalota Auct. On Eycium californicum, 

 Santa Barbara Island. (Trask.) 

 " homalea, Ach. Shore cliffs, Catalina. (Trask, Hasse.) 

 reticulata, (Noehd.) Kremp. Catalina. (Trask.) The 

 network is very open meshed with very slender and 

 terete branches. 

 " combeoides, Nyl. Beach rocks. Catalina. (Trask, Hasse.) 

 On Leptosyne gigantea, San Nicholas, and dead twigs, 

 Santa Barbara Islands. (Trask.) 

 " calicaris fraxinea, Fr. Sterile, Catalina and Santa Bar- 

 bara Islands. (Trask). 

 " intermedia DC. Catalina. On twigs. 

 Usnea barbata hirta, Hoffm. Sterile, on branches. Catalina. 

 " '' f. rubiginosa, Michx. Catalina and San Miguel. 



(Trask.) 

 " " dasypoga, Fr. Catalina. (Trask.) 



