338 Herre 



A particularly luxuriant but aberrant form is found on fences 

 along the Pacific coast. It is distinguished by its large clumps 

 of erect, complicated, and crisped lobes, and great development 

 of the tubercular or cephaloid growths mentioned above, the 

 entire surface being covered with them. This form is usually 

 sterile, though sometimes apothecia are abundant. 

 Cetraria ciliaris Ach. Lich. Univ. 508. 1810; Tuck. Syn. N. 



Am. Lich. i : 34. 1882. 



3. CETRARIA PLATYPHYLLA Tuckerman. 



Thallus thin, compressed, foliaceous, rigid ; lobes appressed 

 and expanded, with elevated tips, or more often ascendant, nar- 

 row at base ; surface rough, covered with tubercles, the lens 

 also often disclosing the presence of many sulphur-colored gran- 

 ules ; color dull dark olivaceous brown ; under surface paler, 

 wrinkled ; medullary layer sulphur-colored or white and cot- 

 tony. Apothecia marginal ; disk shining, darker than thallus ; 

 margin tuberculate. 



A limb of Pseudoisuga taxifoliay brought from the Butano 

 Ridge by Professor Dudley, has on it several plants of this spe- 

 cies, growing with Parnielia enteromorpha. This came from 

 an altitude of about 2000 feet. This specimen has the med- 

 ullary layer cottony, with no trace of the sulphur-color men- 

 tioned by Tuckerman. It does, however, have many minute 

 sulphur-colored grains scattered over the surface of the thallus. 



A single sterile specimen was collected by the author on Loma 

 Prieta, altitude 3788 feet, growing on Adenostovia. In this speci- 

 men the medullary layer is sulphur-colored. 



Identification by the author. 

 Cetraria plaiyfhylla Tuck. Syn. N. Am. Lich. i : 34. 1882. 



4. CETRARIA CHLOROPHYLLA (Ilumb.) Wahl. 



Thallus foliaceous, expanded ; lobes numerous, short, irregu- 

 larly cut ; terminally ascendant, sinuate, crenate, with white 

 sorediate edges ; color varying from olivaceous or greenish dull 

 brown to a shining chestnut, and darker ; beneath paler, wrinkled, 

 and with occasional scattered fibrils. 



Alwa3's sterile with us. 



