NEPHROMIUM.] I'KLJ JUJ-KII, 283 



usually brownish ; hymenial gelatine bluish with iodine. Sper- 

 mogoues marginal, pale ; spermatia somewhat incrassate at either 

 apex, and obtuse. 



distinguished from the allied genera by the poi-ition of the apotliecia 

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

 When rliiziiuc are pieseul, they are composed of nun-fasciculate filaments. 

 Most (if the European species and varieties occur in this country, lliough 

 some of them only very sparingly. 



1 . N. tomentosum Xyl. Mem. Soc. Cherb. v. (1857) p. 101 , Syn. i. 

 p. 319. — Thallus suborbicnlar, lobate or laciniato-lobate, glabrous or' 

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

 beneath ])ale, villose (medulla white, K— ). Apothecia moderate, tes- 

 taceo-red, or reddish-brown, the receptacle crenulato-unequal and 

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

 0,OOt5-7 mm. thick.— Carroll, Journ. liot. 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. Nepliroma resii- 

 jnnata Gray, Nat. Arr. i. p. 426 ; Hook. Fl. Scot. ii. p. 61 ; Sm. Eng. 

 ^\. V. p. 216. 



Readil}' 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. 



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

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

 Braemar, Aberdeenshire. 



Subsp. N. rameum Xyl. f.i'Xorrl. Medd. Sallsk. 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 papillae (pseudocyphell*). Apothecia smaller. — 

 JSejjhromium tomevtosinn var. rameum Leight. Lich. Fl. p. 106, ed. 3, 

 p. 100. JS^ephroma mmtum Schaer. Enum. (1850) p. 18, t. ii. 

 iig. 3. 



The more or less pseudo-cyphellate under surface (the papilhe 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. 



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

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

 Braemar and (Jide Leight. /. c.) Forfarshire ; not observed in recent vears. 

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



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

 Syn. i. p. 320. — Thallus suborbicnlar, rotundato-lobed, smooth, 

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

 brown ; beneath glabrous and slightly rugulose, pale (medulla 



