142 COLLEMA. 



ening; beneath paler, passing with age into two or three ob- 

 scurely distinguishable lobes, with lobulate and crenulate edges ; 

 apothecia numerous, superficial, lecauorine; the disk reddish- 

 brown, bordered by an obtuse margin. Spores ellipsoid and 

 cymbiform, simple, decolorate, ^ mic. ; the capillary paraphy- 



ses distinct. Tuckerm. in Nyl. Syn. 1, p. 105. Collema, 



Nyl. I. c. 



Calcareous rock, Alabama (Peters), Tuckerman 1. c. 1858. 



Apothecia O mm -, 3 to O mm -, 4 wide. 



Very close to 0. botryosa, Nyl., which is by no means always 

 as "endocarpeine" as described; and the latter occurs more or 

 less with the gonidia concatenate, though it is accepted without 

 question by Nylander as an Omphalaria. I find this true also of 

 the gonimous system of the American 0. Girardi. 



Sect. 2. Eucollemei. Thallus foliaceous (or only excep- 

 tionally fruticulose], the whole under side attached to the substrate; 



the gonimia in chains. 







XXVII. COLLEMA, Hoffm., Fr. 



.. Apothecia from very small at length middling-sized, scu- 

 tellseform. Spores ovoid-ellipsoid and cymbiform, now sim- 

 ple ; now fusiform and 2-plurilocular j and now murifonn- 

 plurilocular ; decolorate. Spermatia ellipsoid or oblong; 

 for the most part on jointed sterigmas. The cortical layer 

 of the thallus obsolete j or, with rare exceptions, indistinct. 

 Gonimia in chains. 



* Coll em ell a. Thallus fruticulose. Spores simple. 



1. C. cladodes, Tuckerm.; thallus small, pulvinate, cartila- 

 gineous ; blackish-green ; the terete divisions longitudinally stri- 

 ate and fastigiately somewhat branched ; those of the circumfer- 

 ence stellate-radiant; apothecia minute, terminal, or lateral, 

 depressed-globose. Spores rounded, simple, decolorate, 16-19 

 mic. in diameter. Gen. Lich. p. 89. 



Calcareous rocks, Trenton Falls, N. Y., Tuckerman I. c. 1872. 

 The plant did not yield me spores ; but Mr. Willey has since col- 

 lected specimens which gave him the result above noted. 



* * Lathagrium. Thallus foliaceous, sub-membranaceous, 

 exhibiting now indications, at least interruptedly, of a cortical 



