THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 1 63 



Thallus small or medium, rather rigid and thick, smooth or mar- 

 ginally minutely tomentose, rounded, irregularly laciniate; lobes 

 more or less imbricate, becoming narrowed, crowded, and somewhat 

 crisped marginally; color varying from pale greenish gray to reddish, 

 finally russet or dark brown; pale brown beneath, reticulate with 

 thick brown veins; these thinly sprinkled with coarse brown fibrils. 



Apothecia often clustered, comparatively large; terminal on long 

 narrow lobes; disk reddish brown and darkening; spores spindle- 



4- — 6- 

 shaped, straight or curved, 4-7 locular, ^ fi. 



41.5 - 6ii 

 On earth, moss, and rocks, in the foothills; a cosmopolitan Uchen. 



3. PELTIGERA CANINA (L.) Hoffm. 



Lichen caninus Linne, Syst. Nat. ed. X. 1342. 1753; Fl. Suec. 



1109. 1755. 

 Peltigera canina Hofi'mann, Deutsch. Fl. 2: 106. 1795. 

 Peltigera canina Tuck. Syn. N. Am. Lich. I: 109. 1882. 

 Peltigera canina Herre, Proc. Wash. Acad. Sci. 7: 373. 1906. 



Thallus thin, orbicular, becoming expanded, irregular, and very 

 large; lobes large, broad, imbricate, intricately cut; tips rounded or 

 often more pointed, more or less deeply crenate; surface smooth, or 

 minutely pubescent, this more evident along margin of terminal 

 lobes. Color greenish gray or drab, varying to reddish or brown; 

 beneath very pale, netted with pale prominent veins of the same 

 color, these sometimes darkening centrally; long conspicuous con- 

 colorous or darkening fibrils present. 



Apothecia marginal, numerous; circular, becoming elongate; disk 

 red-brown; spores colorless, 4-8 locular, needle-shaped or elongate 



4- — 6- 

 spindle-shaped, straight or curved, -^^ ^i"- 



45 - 73i 

 On earth and moss throughout. A common lichen of world- 

 wide distribution. 



4. PELTIGERA CANINA MEMBRANACEA (Ach.) Nyl. 



Peltidea canina membranacea Ach. Lich. Univ. 518. 18 10. 

 Peltigera canina membranacea Nyl. Syn. Meth. Lich. 1 : 324. i860. 



