THELOTREMA. 227 



above at length sharp and uneven, shewing more or less at the 

 edge the brown proper exciple, and finally refiexed ; the black- 

 ening disk concealed by a crustaceous, perforated white veil. 

 Spores ellipsoid and oblong ; the transverse series of spore-cells 



four to six, the cells more or less divided ; ^J mic. Mont. 



Cuba, p. 163, t. 8,f. 2. 



Trees, Florida (Austin), Tuckerman Gen. 1872. The 



species, as understood by the writer, is in part exhibited in 

 Wright Lich. Cub. n. 145, 146, 147. According to this view it 

 must include T. Auberianoides, Nyl. N. Gran. p. 43, & Lindig 

 Herb. n. 2711, differing only in the spores being decolorate; T. 

 epitrypum, Nyl. I c. p. 49, Wright Cub. n. 147, considered also 

 to differ in the spores, which a larger view of these organs 

 scarcely confirms; and T. metaphoricum, Nyl. 1. c., & Lindig 

 herb. n. 2814, which is certainly undistinguishable from admitted 

 conditions of Montague's species. 



10. T. Santense, Tuckerm. ; thallus sub-tartareous, incras- 

 sated, rugulose, beset, more or less, with finger-shaped excres- 

 cences ; glaucescent, ash-coloured, or dark-gray ; apothecia 

 small to middling-sized, innate, urceolate-scutellseform ; the 

 dilated, flat disk black, thinly white-pruinose ; the elevated 

 exterior exciple incurved, torn-crenate ; the interior one defi- 

 cient. Spores ellipsoid, the transverse series of spore-cells 



three to five, the cells irregularly divided; ^ mic. Obs. 



Lich. 2, 1. c. p. 406. 



Elm-trunks, low country of South Carolina (Ravenel), Tuck- 

 erman I. c. 1862. In Southern Alabama, Beaumont. 



] 1. T. glaucescens, Nyl. ; thallus cartilagineous, incrassated, 

 punctulate; glaucescent, and pale ash-coloured; apothecia 

 very small to minute, innate, variously difform ; and scarcely 

 bordered except by the lax, white interior exciple ; but becom- 

 ing dilated and sub-scutella3form, and the flat, black, thinly 

 white-pruinose disk margined at length by an elevated and 

 sub-crenate thalline border, with which the thickened interior 

 exciple is concrete. Spores ellipsoid ; the transverse series of 



spore- cells commonly four, irregularly divided, ^ ^ mic. 



Prodr. N. Gran. p. 47, note. 



Trunks and rocks in the low country of South Carolina, 

 Georgia, and Florida (Mavenel), Nyl. Prodr. N. Gran. 1864. 

 Alabama, Beaumont. Louisiana, Hale. As also in Cuba, 



