THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 2OQ 



Thallus becoming fruticose, deeply and irregularly lobed; lobes 

 long, lax or sub-pendulous, narrow to linear, deeply channelled; 

 margins laciniate, erose, and minutely tuberculate; color pale sage- 

 green or gray-green; some times with a brownish cast; beneath white 

 or very pale. 



Apothecia terminal; disk chestnut; margin crenate or more rarely 



entire; spores circular or ellipsoid, - i /*. 



4-9 8 -5 



Very common on trees in the mountains about 1500 feet. Especi- 

 ally abundant on the limbs of Pseudotsuga taxifolia, which it some- 

 times clothes to the exclusion of all other lichens. 



Range not known, but probably occurring throughout central 

 and northern California and to be looked for in Oregon. There is 

 a specimen from Humboldt County in the Tuckerman Herb. 



LI. Nephromopsis Mull. Arg. 



Nephromopsis Mull. Arg. 



Nephromopsis A. Zahlbr. Ascolichenes, 216. 1907. 



Thallus similar to that of Cetraria. Distinguished by the ter- 

 minal apothecia which originate on the under side of the lobes and 

 are directed upward by the twisting or turning of the lobes in the 

 same manner as the apothecia of Nephroma are exposed. 



Species few, of the colder parts of the northern hemisphere. 



KEY TO THE SPECIES. 



A . Thallus greenish to dark brown; lobes narrowed, crowded, mar- 

 gined with minute dark tubercles i. ciliaris 



A A . Thallus dark brown; lobes broad, flat, but little ascendant. 



2. platyphylla 



i. NEPHROMOPSIS CILIARIS (Ach.) Hue. 



Cetraria ciliaris Ach. Lich. Univ. 508. 1810. 

 Cetraria ciliaris Tuck. Syn. N. Am. Lich. I. 34. 1882. 

 Cetraria ciliaris Herre, Proc. Wash. Acad. Sci. 7: 337. 1906. 

 Nephromopsis ciliaris Hue, Nouv. Arch. Mus. Paris. 



Thallus foliaceous, depressed, expanded, irregularly cut and lobed; 

 lobes expanded, leafy, or more often narrowed, crowded, ascendant, 

 and much dissected ; margin of lobes not ciliate but crenate and mar- 

 gined with minute black or dark tubercles; similar tubercles often 



