210 HERRE 



appearing on surface of lobes, or even covering them; color dusky 

 brown, but varying from bright to dusky green, brownish, and dark 

 brown; beneath brownish, wrinkled and pitted, and with occasional 

 fibrils. 



Apothecia terminal or marginal; disk chestnut, the margin crenu- 

 late or minutely tuberculate; spores spherical, 4. 9 to 8 ft in diameter. 



Abundant throughout, on trees, shrubs, and fences, from sea 

 level to 3000 feet or more. 



Examination of many hundreds of specimens has failed to show 

 one according in character with the specific name, marginal cilia or 

 fibrils being invariably absent. 



A particularly luxuriant but aberrant form is found on fences 

 along the ocean shore. It is distinguished by its large clumps of 

 erect, complicate and crisped lobes, and great development of the 

 tubercular or cephaloid growths mentioned above, the entire surface 

 being covered with them. 



A lichen of the United States and Canada; said to occur also in 

 Northern Europe and Asia. 



2. NEPHROMOPSIS PLATYPHYLLA (Tuck.) Herre. 



Cetraria platyphylla Tuck. Syn. N. Am. Lich. I: 34. 1882. 

 Cetraria platyphylla Herre, Proc. Wash. Acad. Sci. 7: 338. 1906. 



Thallus thin, compressed, rigid, foliaceous; lobes appressed, and 

 expanded, with elevated tips, or more often ascendant, narrow at 

 base; surface rough, covered with tubercles, the lens also often dis- 

 closing the presence of many sulfur-colored granules; color dark dull 

 olivaceous brown; under surface paler, wrinkled, naked; medullary 

 layer sulfur-colored or white and cottony. 



Apothecia marginal; disk shining, darker than thallus; margin 

 tuberculate; spores spherical, 4.5 to 9 /* in diameter. 



On Pseudotsuga taxifolia, Butano Ridge, altitude 2000 feet; on 

 Adenostoma fasciculatum, Loma Prieta, altitude 3793 feet. 



A bark lichen ranging from the Sierras westward and from British 

 Columbia to southern California. 



USNEACE^E. 



Thallus fruticose, erect, or lax and decumbent, sometimes pros- 

 trate or pendulous and excessively elongated; attached by a holdfast 



