OMPHALARIA. 141 



in ventricose thekes 8-12 or more, from ellipsoid soon oblong and 



constricted at the middle, simple, decolorate, ^ mic. Obs. 



Lich. 4, I c. 12, p. 170. 



Calcareous rocks, Kansas (Hall], Tuckerman I. c. 1877. 

 Fronds 1-1 mm - in height, with much the habit and internal 

 structure of 0. corallodes (Mass.), Nyl., but smaller, and with less 

 of foliaceous character. Clusters of gonimia soon broken up, the 

 solitary ones 12-19 mic., in the longest diameter; almost defi- 

 cient at the centre. The spores become perhaps finally bilocu- 

 lar ? Apothecia O ram -, 5 to O mm -, 8 wide. 



5. 0. pyrenoides, Nyl. ; thallus squamaceous, black ; the 

 small fronds rounded and convex ; apothecia one in each frond, 

 innate, concolorous, at length somewhat dilated, with an obtuse 

 margin. Spores rounded-ellipsoid, simple, decolorate, -^ mic. 

 Nyl. Syn. l,p. 100. 



Calcareous rocks, Texas ( Wright), Tuckerman in Nyl. Syn. 

 1858. Spermatia minute, ellipsoid ; on simple sterigmas. 



6. 0. pulvinata, Nyl. ; thallus foliaceous, coriaceous-cartila- 

 gineous, black ; of closely aggregated lobes, which are divided 

 more or less, and pass into ascendant, wavy and crenate-cut, 

 rounded lobules ; [apothecia for the most part at the edges of 

 the lobes, tuberculiform, pallescent. Spores short-ellipsoid, 

 simple, decolorate, ^ mic.] Nyl. Syn. I, p. 99. 



Calcareous rocks. Poughkeepsie, N. Y., G. E. Gerard. 

 Shores of Willoughby Lake, Frost. Mountains of Colorado, 



Brandegee in herb. Willey. The apothecia have not as yet 



occurred here. 



7. 0, Girardi, Dur. & Mont. ; thallus coriaceous, black ; 

 with much the aspect and texture of the last but fewer- and 

 much-wider-lobed, and the lobes only sparingly divided and 

 undulate ; [apothecia uroeolate. Spores short-ellipsoid, simple, 



decolorate, -| mic. Mont. Syll. p. 380. Nyl. Syn. I, p. 99. 



Collema plutonium, Tucker m. in litt. 



Calcareous rocks, Alabama (Peters), Tuckerman in Nyl. I. c. 

 1858. Apothecia unknown here. 



f f Gonimia commonly in chains. 



8. 0. Umbella, Tuckerm. ; thallus small, rounded, thick and 

 rigid, sub-monophyllous, granulate ; brown-olivaceous and black- 



