THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA l6l 



Nephromium lusitanicum Herre, Proc. Wash. Acad. Sci. 7 : 37 1 . 1906. 



Thallus expanded, rounded; of medium size but becoming 

 rather large by the coalescence of adjacent plants; deeply and sinu- 

 ately imbricate-lobed; lobes crenate at tip, their margins sometimes 

 minutely crenate or notched, when they simulate the denticulate 

 margins of Nephroma helvetica. Surface smooth, becoming more or 

 less wrinkled; color varying from drab and pale brown to dark 

 chestnut; beneath smooth, more or less wrinkled; pale brown, be- 

 coming dusky and finally black; medullary layer yellow, becoming 

 purple-red with KOH. 



Apothecia numerous, medium to large ; spores 3-4 locular, pale 



brown or colorless, /^' 



16 — 24 



Very abundant on mossy sandstone and trunks of oaks in Devils 

 Cafion, altitude 2300 feet. Not found as yet elsewhere, but to be 

 looked for in similar situations. 



Recorded from Portugal, Spain, Italy, Switzerland, British Isles, 

 Canary Islands, Java, Oregon, and CaHfornia. 



XLI. Peltigera Willd. 

 Peltigera Willdenow, Fl. Berol. 47. 1787. 



Thallus leafy and large-lobed, rarely reduced, horizontally ex- 

 panded or marginally ascendant, attached by tufted rhizoids; upper 

 side naked or finely pubescent; under side without cortex, beset 

 with more or less anastomosing netted veins. 



Apothecia circular, marginal, adnate on the upper side of the 

 more or less extended and narrowed fertile lobes, flat or laterally re- 

 curved, without margin; disk covered with a veil, the rest of the 

 upper cortex under which the apothecium rises, which later splits, 

 the fragments margining the fruit; hypothecium clear to brownish; 

 paraphyses simple, septate, thickened at the tips; asci 6-8 spored; 

 spores colorless or brownish, elongate-ellipsoid, spindle or needle- 

 shaped, 4-S locular, thin walled. 



KEY TO THE SPECIES. 



A. Thallus more or less marginally sorediate i. scutata 



A A. Thallus never sorediate. 



