LEPTOGIUM. 155 



longitudinally striate ; apothecia of middling size, biatorine, ap- 

 pressed; the disk flattish, brown-red; the thin, paler margin 

 nearly entire. Spores cymbiform and fusiform-oblong, bilocu- 



lar, decolorate, ^^ mic. Nyl. Syn. 1, p. 134. 



Growing over mosses on rocks in mountains. White Mount- 

 ains, Tuckerman Gen. 1872. Brattleborough, Vermont, Frost. 

 California (in the Yosemite Valley, 7-8000 feet altitude, and also 

 at 1500 feet altitude on coast-rocks exposed to the sea-fog), 

 Bolander. Islands of Behring's Straits, Wright. 



4. L. bolacinum, Stizenb. ; thallus minute, pulvinate, terete, 

 sub-dichotomously much-divided ; pale-lead-coloured and ash- 

 coloured, the tips much diminished, dissected, and darker; apo- 

 thecia unknown. Parmelia lacera v. bolacina (Ach.) Schcer. 



Spicil. p. 519. Cornicularia Umhausensis, Auerswald in Hed- 

 wigia, 1869, & Eabenh. Lich. Eur. 862. 



Rocks among mosses, Massachusetts, Tuckerman Gen. 1872 ; 

 Willey. New Jersey, Austin. Illinois, Hall. South Carolina, 



Havenel. Acharius marks this as unknown to him, having 



taken it up from Dill. t. 29, f. 35, the reference of our plant to 

 which seems a little uncertain; but it is possible that the 

 Swedish lichenographer, who cites Schleicher's published speci- 

 men of Coll lacerum, a, Ach., may also have seen the present 

 (C. lacerum, e, Ach.) known at least later to Schleicher, accord- 

 ing to Schaerer. The latter described but did not publish what 

 he took for the lichen ; I cannot however but regard it as rep- 

 resented by the right-hand specimen (in my copy) of his P. atro- 

 ccerulea d, lophtea (Lick. Helv. n. 407), which agrees with the de- 

 scription of his bolacinum, and is well- distinguished from all L. 

 lacerum. Nylander (Flora, 1876, p. 578) first pointed out that 

 the 'glomerules' of the European Sticta amplissima are quite the 

 same with Leptogium bolacinum; and he regards this as an 

 analogous growth to the European ' Stereocaulon nanum,' u which 

 is," he declares, "no Stereocaulon, nor anything related to that 

 genus, but a kind of Lepraria, and, like l Parmelia lanuginosa,' 

 and other leprarioid crusts, never produces apothecia." The 

 Stereocaulon is unknown here ; but it is curious that our form of 

 the Sticta named (Tuckerm. Lich. Amer. exs. n. 105, which is 

 accepted in Nyl. Syn.) never bears ' glomerules.' 



* * Lathagrium. Tliallus foliaceous. Spores from cymbi- 

 form bilocular, becoming long-fusiform and plurilocularj with 

 entire spore-cells. 



