THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 49 



IV. Arthopyrenia. 



Thallus thin, with an indistinct hypothallus as a rule. Apothecia 

 with a globose or hemispherical, horny, black perithecium; para- 

 physes permanent or gelatinizing; spores wedge-shaped, oval, or 

 elongate, with usually blunt ends. 



KEY TO SPECIES. 



A . On maritime rocks ................................. i. halodytes 



A A. On bark. 

 B. Spores bilocular, arranged in one row in the asci. 



C. Paraphyses slender, distinct ..................... 6. conformis 



CC. Paraphyses threadlike, branched, entangled ........ 5. biformis 



BB. Spores bilocular, often with a halo, variously arranged in the asci. 



D. Paraphyses gelatinizing ........................... 2. analepta 



DD. Paraphyses distinct. 



E. Apothecia naked ............................ 3. analeptella 



EE. Apothecia more or less pruinose ......... 4. cinerea-pruinosa 



Section EUARTHOPYRENIA. 



Perithecia usually hemispherical; paraphyses normally becoming 

 gelatinous; spores usually with a gelatinous halo, constricted in the 

 middle, of 2 dissimilar cells, either cell or both sometimes further 

 divided. 



i. ARTHOPYRENIA HALODYTES (Nyl.) Wedd. 



Verrucaria halodytes Nyl. Enum. generate des Lichens, 142. 1858. 

 Arthopyrenia halodytes Weddell, Excurs. lich. d. Pile d'Yeu, 307. 



1874. 



Arthopyrenia halodytes Olivier, Lich. de POuest et Nord-O. France. 

 2 : 261. 1900. 



Thallus effuse, thin and uniform, or irregularly thickened, when it 

 becomes somewhat fissured; blackish reddish or reddish brown; 

 KOH -- ; CaCl 2 O 2 -. 



Apothecia very small and numerous, black, more or less immersed, 

 or emergent and sub-globose; scattered or becoming clustered and 

 crowded; paraphyses mostly lacking, rather thick and jointed when 



present; asci ventricose, - - 1 /z; no reaction with I; spores 



49 - 62 



bilocular, ellipsoid, irregularly arranged in the asci, 



ii- 14.7 



