174 PROCEEDINGS OF THE AMERICAN ACADEMY 



cited, notwithstanding the now clear thalline border, on account of the 

 black hypotlieciiim, and the evident resemblance to B. albo-atra. But 

 Rinodina makes many approaches to Buellla, and the color of the 

 hypotliecium proves to be an insufficient criterion. Nylander, indeed 

 ( Obs. Pijren. p. 52) has referred BiielUa albo-atra to the group now 

 before us ; the reference being, however, determined by the presence 

 of truly jointed sterigmas. I have been unable myself as yet to find 

 multi-articulate sterigmas in the specimens examined of this species, 

 or of that described above, but what might rather be taken for sub- 

 simple forms of the organ in question occur sometimes with a few 

 swollen joints. As originally observed, this lichen appeared comparable 

 rather, as respects thallus, with such effigurate ones as Lecanora circi- 

 nata; but the best developed plant (San Diego, Herb Willey) has a 

 laciniate circumference like that of Placodium candicans ; while on the 

 other hand depauperate conditions occur with no trace of a lobulate 

 margin. 



Rinodina thtsanota, sp. nov. : thallo crustaceo verrucoso ambitu 

 radioso-lobato fusco-olivaceo ; apotheciis (qu. visis 0,5-0,7 mm. latis) 

 lecanorinis sessilibus, margine tumidulo integro discum nigro-fuscum 

 cingente. Hypotliecium pallidum. Spoi'oe octonaj, brevi-elliijsoideae, 

 biloculares, fuscaj, longit. 0,010-14™"'-, crassit. 0,005-6'"'"-. 



Rocks, alt. 7,000 feet, in Alpine County, California, /. A. Lapham. 

 Thallus, in the single specimen, differenced much as in R. oreirm. 

 Reaction of the hymeneal gelatine with iodine, blue. 



Rinodina mamillana, Tuckerm. Lich. Hawai. in Proceed. Amer. 

 Acad., 7, p. 226, has been collected more recently in the Galapagos 

 Islands, Rev. T. Hill (Hassler exp ). Apothecia of both lichens similar 

 in size (0,3-0,8"™- wide), but the specimens of that from the Galapagos 

 not exhibiting the peculiar protuberance and plaiting of the disk which 

 suggested the specific name, and their thalline margin at length black- 

 ening. Hypothecium in both blackish-brown. Spores, 0,012-20"""- long 

 and 0,005-10"""- thick ; the paraphyses at length distinct. Thallus higlier- 

 or sulphur- colored in the South American plant. 



Rinodina ochrotis : thallo crustaceo granuloso mox fatiscente 

 furfuraceo albido ; apotheciis (qu. visis circ. 0,5 mm. latis) lecanorinis 

 sessilibus, disco e livido-carneo fuscescente, margine obtuso integro. 

 Hypothecium pallidum. Sporoe parv^e, obtuse ellipsoide«, biloculares, 

 fuscge, diam. 2-3° longiores. — Lecanora, Mihi in Wright Lich. Cub. 

 n. 115. 



On charred surfaces of logs, IMonte Verde, Island of Cuba, G. Wright. 

 The description was reserved in hope of other specimens being sent. 

 In the absence of such, I can now add nothing to the above. 



