140 OMPHALAEIA. 



punctiform aperture. Spores in sub-fusiform thekes 9-18, ellip- 

 soid and globular, simple, decolorate, -^~ mic. Tuckerm. Gen. 



p. 84. 0. Demangeonii, Mont, in Ann. Sci. Sept., 1849. 0. 

 Silesiaca, Koerb. Syst. p. 423. Phylliscum endocarpoides & 

 P. Demangeonii, Nyl. Syn. 1, 136, t. 3, /. 5. P. endocarpoides, 

 Koerb. Parerg. p. 443. Schwend. Undersuch. in Naeg. Beitr. 

 1868, 4, 194. 



Granitic rocks, White Mountains (Eussell), Tuckerman Gen. 

 1872. Vermont, Frost. Massachusetts, Willey. Ehode Island, 

 J. L. Bennett. Shores of Lake Superior, Agassiz. Oregon, Hall. 



This plant, the whole aspect of which is that of Omphalaria 

 proper, as is the general internal structure, differs yet in the 

 early breaking up of the gonimous clusters which so commonly 

 characterize the section, and the large size of the then solitary 

 gonimia, as well as in the feebler development of gelatinous pulp; 

 in both which respects it looks rather towards Pyrenopsis. It is 

 possible then to regard it as an intermediate type between Py- 

 renopsis and Omphalaria. As now accepted as a genus by 

 authors the distinction turns however, if we mistake not, less on 

 the thalline differences than on the assumption of an essential 

 difference in the fruit j that this namely, instead of being to be 

 considered, in spite of its diffluent paraphyses, from the point of 

 view of the Collemeine group to which the plant manifestly be- 

 longs by its other characters, and in which inexplicate apothe- 

 cia, so surprisingly exhibited in 0. leptophylla and 0. deusta of 

 the island of Cuba, are the rule, shall be reckoned a perithe- 

 cium ; an opinion which we take for untenable. 



* * * Omphalaria proper. Thallus foliaceous, attached to 

 the substrate at only a single point ; the gonimia in clusters ; or 

 rarely (n. 8) in chains ; interspersed among hyphce, in a homo- 

 geneous pulp. This group is distinctly gelatinous and Colle- 

 meine. The species with concatenate gonimia are indeed referred 

 to Collema by Nylander (Syn.} ; but belong naturally, by the 

 peculiar attachment, and whole habit, with the others. 



f Gonimia in clusters. 



4. 0. Kansana, Tuckerm. ; thallus pulvinate, rigid, black, 

 made up of stipitate, erect, clavate fronds which become lobate 

 above, or, from the dilated fruit, pileate ; apothecia sub-terminal, 

 concolorous, soon convex and the margin disappearing. Spores 



