180 PROCEEDINGS OF THE AMERICAN ACADEMY 



nigris, margins tenuissimo demisso mox nigricante vel evanido. Hypo- 

 thecium nigrum. Sporae octon£e, ex ellipsoideo oblongae, biloculares, 

 incolores, longit. 0,009-15"""-, crassit. 0,0(»3-4"""-, parapliysihus coalitis. 

 — On the bark of white pine, New Bedford, Mass., Mr. Willey. The 

 well-developed crust, the hypotliecium, and the paraphyses distinguish 

 this from B. lenticulans (Acli.), &c. 



BiATORA LiviDO-NiGRrcANS, sp. Hov. : thallo e granulis cartilagi- 

 neis discretis livido-glaucescentibus ; apotheciis minutis (latit. 0,2-0,4 

 mm.) sessilibus plauis tenuiter marginatis fusco-uigris. Hypoihecium 

 pallidum. S[)or9e octonjB, dactyloideas et oblongte, 4-o-locuhires, inco- 

 lores, longit. 0,015-23"'™-, crassit. 0,003-6"™-, paraphysibus distinctis, 

 capitulatis. — On bark, Sandy Point, Straits of Magellan, Jiev. T. Hill 

 (Hassler exp. 1872). Specnuen a very small one, but the characters 

 sufficient to distingnish the lichen from Lecidea sororiella, Nyl., of New 

 Grenada (Lindig exs. n. 2838) as from the Australian L. Uvido-fusca, 

 Nyl. (Si/n. JV. Caled. p. 42, not.) and L. licido-fuscescens, Nyl., of 

 Brazil {Flora, 1869, p. 122), all of which are taken by their author to 

 relate nearly to Blatora trachona, Flot. With iodine a vinous tint is 

 exhil)ited by the hymeneal gelatine of the antarctic lichen, following 

 a bluish. 



Lecidea mamillana, sp. nov. : thallo squamaceo-areolato viridi- 

 glaucescente (cinerascente aut dealbato) areolis mox turgescentibus 

 radiatimque striatulis ambitu sublobatis, discretis vel dein aggregatis ; 

 apotlieciis in areolis innatis centralibus minutis (latit. 0,3-0,7 mm.) 

 plano-convexis nudis margine tenui evanido. Hypothecium fuscum. 

 Sporse octon^e, ellipsoidete, simplices, incolores, longit. 0,009-1 8™™-, cras- 

 sit. 0,005-9""-, paraphysibus conglutinatis. Spermatia minuta, recta, 

 in sterigmatibus simpliciusculis. — On lime rocks, Alabama, Judge 

 Peters. Suggests L. mammlllaris (Gouan) Duf., of the soutli of 

 Europe ; but the areoles, for the most part, are little more than a 

 quarter of the size of those of the European lichen. Tiiey occur now 

 in a reduced, glebous state, which is quite smooth, glaucescent, and 

 finally crowded into a close crust ; but are more commonly discrete, 

 when the effigurate margin is manifest, the color often darkens, and 

 the surface is at length prettily marked with striae radiating from the 

 apothecium, instead of becoming cancellated, as in the foreign plant. 

 As seen in section, no important differences are observed in the internal 

 structure of the apothecium of our lichen from that of X. mammilhiris, 

 though the thinner hypothecium of ours is possibly also paler. I cannot 

 recognize in either the distinctly twofold hypothecium sometimes at- 

 tributed to this group of Lecidece. 



