NEPHROM1UM.] PELIIGEREI. 283 



usually brownish ; hymenial gelatine bluish with iodine. Sper- 

 mogones marginal, pale ; spermatia somewhat incrassate at either 

 apex, and obtuse. 



Distinguished from the allied genera by the position of the apothecia 

 and the cortical layer being continuous on the nerveless under surface. 

 When rhizinaa are present, they are composed of non-fasciculate filaments. 

 Most of the European species and varieties occur in this country, though 

 some of them only very sparingly. 



1. N. tomentosmn Nyl. Mem. Soc. Cherb. v. (1857) p. 101, Syn. i. 

 p. 319. Thallus suborbicular, lobate or laciniato-lobate, glabrous or 

 thinly tomentose, livid-glaucous or livid-chestnut or lurid-brown ; 

 beneath pale, villose (medulla white, K ). Apothecia moderate, tes- 

 taceo-red, or reddish-brown, the receptacle crenulato-un equal and 

 villose at back ; spores colourless or brownish, 0,020-24 mm. long, 

 0,006-7 mm. thick. Carroll, Journ. Bot. 1865, p. 288 ; Cromb. 

 Lich. Brit, p. 28 ; Leight. Lich. Fl. p. 105., ed. 3, p. 99. Peltigera 

 tomentosa Hoffm. Deutsch. Fl. ii. (1795) p. 108. Nephroma resu- 

 pinata Gray, Nat. Arr. i. p. 426 : Hook. Fl. Scot. ii. p. 61 ; iSm. Eug. 

 Fl. v. p. 216. 



Readily distinguished by the villosity of the under surface of the 

 thallus. The upper surface also is not unfrequently thinly tomentose, and 

 sometimes also more or less sorediate, though these characters do not 

 appear in our few British specimens. The apothecia are somewhat nume- 

 rous, and the spermogones, which are occasionally present, have the sper- 

 matia 0,005-6 mm. long, 0,0015 mm. thick. 



Hob. On the trunks of old trees in rocky upland situations. Distr. Very 

 local and rare, on the N. Grampians, Scotland. B. M. : Craig Cluny, 

 Braemar, Aberdeenshire. 



Subsp. N. rameum Nyl. ^Norrl. Medd. Siillsk. F. et Fl. Fenn. i. 

 (1876) p. 18. Thallus smaller, thinner, somewhat broadly lobed, 

 glaucous, lobules appressed, expanded ; the under surface pale, vil- 

 lose, with white papilla? (pseudocyphellae). Apothecia smaller. 

 Kephromium tomentosum var. rameum Leight. Lich. Fl. p. 106, ed. 3, 

 p. 100. Nejjhroma ramtum Schasr. Enum. (1850) p. 18, t. ii. 

 fig. 3. 



The more or less pseudo-cyphellate under surface (the papillae usually 

 being numerous) gives this the rank of a subspecies. The apothecia are 

 smaller, but internally similar to those of the type. There are no spermo- 

 gones on the only Biitish specimen I have seen. 



Hab. On the branches of old trees (birches) in wooded upland districts. 

 Distr. Extremely local and rare on the N. Grampians, Scotland, in 

 Braemar and (fide Leight. /. c.) Forfarshire ; not observed in recent years. 

 B. M. : Near Invercauld, Braemar, Aberdeenshire. 



2. N. laevigatum Nyl. Mem. Sec. Cherb. t. v. (1857) p. 101, 

 Syn. i. p. 320. Thallus suborbiciilar, rotundato-lobed, smooth, 

 subopaque, sinuato-crenate at the margins, chestnut- or livid- 

 brown : beneath glabrous and slightly rugulose. pale (medulla 



