150 COLLEMA. 



less concave, disk dark-rufous, margin granulate. Spores as in 



12, Y! mic. Borr. in E. Bot. Suppl. t. 2716, /. 1. Hook. Br. 



Fl. 2, p. 212. Mudd. Man. Brit. Lick. p. 40. Nyl. Syn. 1, p. 

 110. 



On the earth, Canada (Drummond), Tuckerman Gen. 1872. 

 Massachusetts, Willey. Vermont, Frost. New York, Sartwell. 

 Ohio, Miss Biddlecome. Colorado, Rothrock. British Columbia, 



scarcely diverse, Macoun. Our lichen is noticeable for its 



hollowed apothecia ; and appears to be less distinctly calcare- 

 ous than the last, to which however it is near. Nylander's plant 

 (Lick. Fellm. n. 7; Lich. Norrl n. 151) scarcely differs from that 

 of Borrer (herb. Taylor), who first made clear its difference. 



12(e). C. limosum, Ach.; thallus thin, cartilagineous, more 

 or less scattered ; from leek-green becoming dark-green ; the 

 variously irregular, soon obliterated lobes dentate-crenate, or 

 narrowed now into ascendant, blunt lobules; apothecia im- 

 mersed, becoming superficial and dilated ; the disk rufous, the 

 attenuate margin rather prominent and channelled. Spores 

 commonly in fours in the thekes, ellipsoid, soon muriform-plu- 

 rilocular, the transverse series of spore-cells four to eight, de- 



colorate, j~ mic. Nyl. Syn. 1, p. 110. C. glaucescens, Koerb. 



Syst. p. 403. 



On the earth in clay soil. Illinois (HaU), Tuckerman Gen. 

 1872. New York, Clinton. South Carolina, Austin ; Eavenel. 



Oakland hills, California, Bolander. Well distinguishable by 



the mostly crowded, flat, at length ample apothecia, with little 

 other appearance of thallus than the sharp and channelled bor- 

 der of the fruit, as also by its large spores, which are very com- 

 monly in fours. Our plant is the same with that of Borrer (E. 

 Bot. Suppl. t. 2704, f. 1, & in herb. Taylor!), who had opportu- 

 nities of knowing Acharius's lichen ; and the same also as that 

 of Torssell (herb. !) who knew Fries's j from which last, accord- 

 ing to Nylander I. c., his own does not differ. Hoffmann's de- 

 scription of his C. glaucescens (D. Fl. p. 100) is scarcely sufiicient. 



12(/). C. coccophorum, Tuckerm. j thallus small, orbicular, 

 coriaceous; black; made up of minute, erect, round-headed 

 lobules or stalked granules, which here and there coalesce, and 

 expand at the circumference into crenate-cut and granulate 

 lobes ; apothecia flat ; the disk reddish-brown, the margin thin, 

 finally granulate. Spores ovoid -ellipsoid, bilocular, mostly 

 decolorate, mic. Obs. Lich. 1. c. 5, p. 385. 



