HO ERIODERMA. 



diata passes however directly into /? in the same district of South 

 Carolina (on moist rocks), Eavenel (as the European lichen may 

 "be seen to do in Moug. & Nestl. n. 837, and Rabenh. lAcli. Eur. 

 n. 421, c.), and is found also (on moist rocks) in the White 

 Mountains, Tuckerman; on banks of islands of Behring's Straits, 

 Wright; in Illinois (on the earth), Hall; and in California (on 

 the earth), Bolander. The best-developed, sorediiferous plant 

 (now fertile) of the White Mountains is remarkable for the finally 

 dense nap of its under side, which thus far resembles then the 

 b. spongiosa of the same region. But this fibrillose nap disap- 

 pears at length ; and the common plant of the Atlantic coast is 

 quite the same with the P. erumpens, Tayl. ! (Duukerron, Ire- 

 land) which I have myself observed in the north of Italy (Pal- 

 lauza), but find scarcely any notice of in European writers. The 

 California!! specimens (infertile, but unquestionably similar to 

 the fertile Carolina lichen) are yet so reduced as to be mostly 

 simple (from these, P. leptoderma, Nyl., of New Granada, as ex- 

 hibited in Lindig's collection above-cited, offers no differences) 

 and thus reproduce, at the end, this remarkable feature of P. 

 venosa, at the beginning. 



XVII. ERIODERMA, Fee. 



Apothecia scutellseform j marginal on the now extended 

 lobules. Spores ovoid-ellipsoid, and becoming sub-fusiform ; 

 simple j at length colourless. Thallus froudose, villous, and 

 now veiny beneath, where it is also now clothed interrupt- 

 edly with a pannose hypothallus j a proper cortical layer 

 wanting on this side. Gonimous layer constituted of go- 

 nirnia. Another small group, of especial interest as illus- 

 trating the near relationship of the Peltigerei, to which all 

 other authors but Nylander have referred Erioderma, to the 

 Pannariei. The species are tropical, or austral. 



E. polycarpum, Fee; thallus membranaceous, hirsute; green- 

 ish-glaucescent; the summits of the laciniate lobes crenate-cut 

 and crisped ; beneath soft-cottony, whitish, beset with spongy 

 tufts of black fibrils ; apothecia marginal j hirsute below ; the 

 dark-brown disk soon excluding the thin margin. Spores ellip- 

 soid, becoming colourless, ^^ mic. Fee, Essai sur Us Crypt. 



p. 145, *. 24,/.2. 



