OF ARTS AND SCIENCES. 419 



they are smaller. In one of the specimens from New Mexico the scales 

 are white-pruinose. 



Lecidea (Biatora) ptrrhomel^na. Biatora, Tuckerm., Suppl. 

 1. c. Trunks, in the island of Cuba, Mr. Wright. 



Lecidea (Biatora) ph^aspis. Biatora, Tuckerm., Suppl. 1. c. 

 With the last. 



Lecidea (Biatora) virella. Biatora, Tuckerm., Suppl. 1. c. 

 With the last. 



Lecidea (Biatora) melampepla, sp. nov. : thallo leproso-tartareo 

 difFracto-rimoso ferrugineo-fuscescente, hypothalio nigricante ; apotheciis 

 submediocribus appressis e piano tumidulis intus incoloribus, disco nigro 

 primitus albo-pruinoso margine crassiusculo pallidiore demum concolore 

 cincto. SporEB fusiformi-oblongae, subincurvas, diblastte, diam. 3 - 5-plo 

 longiores. On shrubs ; hills near Simon's Town, Cape of Good Hope 

 (U. S. N. Pacific Expl. Exp.), Mr. Wright. Thallus making small 

 roundish patches, from scurfy at length compacted and chinky, rusty- 

 brown, rarely black-bordered by the hypothallus. Apothecia grouped 

 somewhat concentrically, almost middling-sized or smallish (the larger 

 ones from a third reaching rarely half a line in diameter), appressed ; 

 a thickish, pale, biatorine exciple bordering a black, originally white- 

 pruinose, flat, or at length rather tumid disk (which is colorless within), 

 and becoming finally of the same color with it. Spores in clubshaped 

 spore-sacks, small, coloi'less, from oblong-ellipsoid becoming fusiform- 

 oblong, often very slightly or scarcely bent, diblastish ; the length 

 from thrice to five times exceeding the diameter. Paraphyses con- 

 glutinate. Near to L. mixta (Fr. Lich. Suec. n. 40), of which Mr. 

 Wright collected excellent specimens at the Cape of Good Hope, but 

 very distinct in its rusty-brown, subtartareous thallus, and larger 

 apothecia. Biatorina, Massal. (Ric. p. 134, Koerb. Syst. p. 189, to 

 which the present lichen is referable), however unavoidable a part of 

 the system to which it belongs, appears none the less a forced associa- 

 tion of forms, of distinct and sometimes even remote afiinities, held 

 together by nothing but the diblastish differentiation of the spores. 



Lecidea (Biatora) chlorosticta, Tuckerm. Lich. exs. n. 139 : 

 thallo effuso e granulis subsparsis rotundatis liBvigatis viridi-glauces- 

 centibus ; apotheciis minutis sessilibus primitus convexis subimmargina- 

 tis e livido nigris nitidis dein turgidulis papillatis, hypothecio nigricante. 

 SporjE suboctonte, incolores, aciculares, di - tetrablasta3, diam. 6- 12-plo 

 longiores. On trunks of white cedar (Cupressus thyoides) in Hingham, 



