OF ARTS AND SCIENCES : APRIL 12, 1864. 273 



granulose condition (rather comparable, as respects the thallus, with 

 Lich. Cub. n. 183, to be noticed under b, and also with Lich. Cub. n. 

 185), with a blackish-brown hypothallus, but apothecia and spores not 

 unlike those of the other. In Lich. Cub. n, 179, the squamules are 

 now white-pubescent beneath (a feature finally disappearing, with the 

 hypothallus, in this form), and the same development is observable in 

 n. 180, and also in n. 186, which last I take to be L. parvifolia, as 

 limited by Nylander (1. c), who brings this feature into his description.* 

 Like everything else, the hypothecium also varies in these forms from 

 pale to dark-brown. 



b. Sporfe minores saepius ellipsoidete. (Wright. Lich. Cub. n. 181.) 

 L. breviuscula, Nyl. 1. c. The thicker, larger, crenate squamules of 

 this form are more appressed, with something of an etfigurate aspect, 

 and are often bordered by the conspicuous, lurid-brown, here fibrillose 

 hypothallus ; while the thallus itself becomes at length more or less 

 brownish. But there is nothing here to separate the lichen from states 

 of a ; and the ellipsoid spores become finally oblong. From this, the 

 lichen in Lich. Cub. n. 183 {L. intermediella, Nyl. 1. c.) appears to me 

 to differ much as the subgranulose state of n. 179, from the squamulose 

 one. The hypothecium varies in these forms, as in a. 



c. Spora3 adhuc minores. (Wright. Lich. Cub. n. 182.) L. parvi- 

 foliella, Nyl. 1. c. Thallus from greenish becoming pale yellowish and 

 at length brownish, the crenate scales passmg into narrowly lobed ones, 

 the hypothallus and the apothecia (which are at fii'st brown) finally 

 black, and the hypothecium blackish-brown. Spores of the species, but 

 smaller than in the other forms. 



d. coralUna: squamulis coraUinis. (Wright. Lich. Cub. n. 184.) 



e. subgranulosa : thallo diminuto squamaceo-granuloso. (Wright. 

 Lich. Cub. n. 185.) Such appears to me to be the range of variation 

 of this species, so far as exhibited in the rich collections of Mr. Wright. 

 It is no more perhaps than were fairly to be presumed in a widely- 

 spread, squamulose lichen, developed by tropical moisture and heat. 

 Much as some of these forms diverge from others in the thallus and 

 apothecia, these differences do not appear to afford satisfactory grounds 



* Biatora Fendkri, Mont. & Tuck, in Ann. Sci. ser. 4, 8, p. 296, from Venezuela, 

 is an elegant expression of this pubescent form, comparable with Lich. Cub. n. 186, 

 and also with n. 181 of the same collection. 



