48 HERRE 



2. ENDOCARPON PALLIDUM Ach. 



Endocarpon pallidum Acharius, Lich. Univ. 301. 1810, Switzerland. 



Thallus of small pale reddish or darker scales, these overlapping, 

 flexuous, and more or less marginally upturned; the rounded lobes 

 with more or less crenate margin; KOH ; CaCl 2 O 2 . 



Apothecia minute, immersed, opening to the surface by a pore 

 which sometimes becomes enlarged; perithecium dark brown, entire; 



spores 2, from pale becoming light brown, /*; Dr. Hasse gives 



31.8-37 



4- V* **v\ o r 



45 - 52 

 Rare, on stones in the foothills; found in Europe, North America, 



and New Zealand. 



3. ENDOCARPON PULVINATUM Th. Fr. 



Endocarpon pulvinatum Th. Fr. Lich. Arctoi, 257. 1860. 

 Polyblastia pulvinata Jatta, Syll. Lich. Ital. 562. 1900. 



Thallus dark chocolate-brown, the squamules more or less imbri- 

 cate, lobulate, with irregularly crenate or incised margin, the whole 

 plant resembling a minute Gyrophora; apothecia very small, immersed, 

 the perithecium more or less protruding, black; asci clavate; spores 2, 



muriform multilocular, /*. 



14 - 17 



On boulders in the foothills; rare. A lichen of arctic and alpine 

 Europe. 



PYRENULACE^E. 



Thallus uniform crustaceous, without cortex or rhizoids; growing 

 upon or within the substratum; the algae Trentepohlia. Apothecia 

 single or confluent, erect, with a terminal pore; spermatia exobasidial. 



KEY TO GENERA. 



Paraphyses branched and twining, or becoming gelatinous ; spores 2 -6 



celled IV. Arthopyrenia 



Paraphyses unbranched, free; spores 2 many celled V. Porina 



