274 FLORA OF MOUNT DESERT. 



* V. bryophila, Lonnr. 



Thallus whitish, encrusting certain mosses. Apothecia con- 

 nate. Spores muriform. On the coast. Southwest Harbor 

 (Eckfeldt). 



PYRENULA, Ach.* 



* P. punctiformis (Ach. ), Naeg. 



Thallus dark olivaceous, very thin, evanescent. Apothecia 

 black, polished, very minute, conoid. Spores linear oblong, 

 2-locular, ;JJ|^| mic. On tree barks and dead wood. (Eck- 

 feldt.) 

 *P. nitida, Ach. 



Thallus pale yellow or olivaceous to brown, shining, smooth 

 with scattered minute white nodules. Apothecia large, black. 



Sp res oo6 - 008 m * c< On smoot h tree barks. Southwest Harbor 

 (Eckfeldt).' 



P. thelsena, Ach. 



Thallus uniform, mostly dark or fuscous. Apothecia small, in- 

 nate. Spores colored, -Jfr^ m i c - Southwest Harbor (Eckfeldt). 



* P. lactea, Mass. 



Thallus cream-colored, very thin, spread out over the surface 

 and limited. Apothecia black, minute, sessile, somewhat in- 

 nate, becoming hemispherical. Spores broadly fusiform, 5-7- 

 locular, '-^^ mic. Seal Harbor (Eckfeldt). 



* P. gemmata (Ach.), Naeg. 



Thallus white, thin, continuous, smooth or rimulose. Apo- 

 thecia black, large, prominent, roughish, hemispherical. Spores 

 broadly oblong, 2-locular, ^ " "^ mic. On trees. Southwest 

 Harbor (Eckfeldt). 



* For description of genus, see Tuck., Syn. N. A. Lichens, part i., 15. 



