Lichens of Santa Cruz Peninsula 331 



I. Ramalina Acharius. 



Apothecia shield-like, scattered, marginal, or terminal, sub- 

 pedicellate, concolorous ; spores ellipsoid or curved, colorless, 

 bilocular. Thallus fruticose, tufted, erect or pendulous, terete 

 or compressed, alike on both sides ; color pale green, varying 

 from white or gray to a yellowish glaucous green. 

 Ramalina Ach. Lich. Univ. 122. 1810. 



KEY TO THE SPECIES. 



a. Habitat, maritime rocks. 



b. Thallus terete, smooth or wrinkled. 



c. Sparingly branched, blackening at base ; apothecia lateral. 



I. ceruchls, 33 1« 

 cc. Thallus much shorter than above, simple; not blackening; 



apothecia terminal 3. combeoides^ 332. 



bb. Thallus compressed, two-edged 4. homalea^ 332. 



aa. Habitat, trees, shrubs, fences. 

 d. Apothecia abundant. 



€. Thallus a lace- like net-work, long, pendulous, much branched 



and tangled 5. reticulata^ 333. 



ee. Thallus tufted, erect or pendulous, little branched, compressed, 



two-edged, not sorediate 6. menziesil, 334. 



dd. Apothecia rare, inconspicuous, or none. 

 f. Apothecia never present; thallus terete, thread-like, with con- 

 spicuous bluish soredia ; on maritime trees, shrubs, and old 



fences.. 2. ceruchis cephalota^ 332. 



ff. Apothecia rare or inconspicuous. 



g. Plants tufted, erect or pendulous, compressed, two-edged 

 or linear; white or pale soredia abundant. 



7. farinacea^ 335' 



gg' Thallus very small, erect, tufted, much branched, with 



filiform tips; soredia not present 8. r ig I da ^ t^t^^. 



I. RAMALINA CERUCHIS (Ach.) DeNot. 



Thallus tufted, terete, smooth, becoming wrinkled ; sparingly 

 branched, the tips pointed ; color yellowish green, basally black 

 or blackening ; apothecia (not seen) lateral. 



The long, cylindrical, pointed thallus of this species serves to 

 separate it very markedly from the other Ramalinas. 



I have obtained the typical form but once, and then it was 



Proc. Wash. Acad. Sci., March, 1906. 



