I-EI'TOGIUM.] 



/O 



ppecies, viz. L. Brehissonii Mont., and L. chlorowehtm Nyl. ; but it is quite 

 distinct from both. According to Kyi. {in lift.}, L. lirebissonii ha» the 

 thallus less plicatulo-coiTUgate, and is moreover ■whitish- or grevish- 

 downy beneath ; while L. chlvromdvm (an American species) has the 

 thallus and receptacle less corrugate, the latter being subsmooth. The 

 specimens found in this country are sterile. 



Hah. On the trunks of old trees and on rocks among messes in mari- 

 time and mountainous districts. — Distr. Sparingly in N. Wales and S.AV. 

 Ireland. — B. M. : Garth, near Dolgelly and Barmouth, Merionethshire. 

 Eagle's Nest and Dinish, Killarney, co. Kerry. 



Subgen.4. MALLOTIUM Ach.Lich. Univ. (1810) p. 644.— Thallus 

 membrauaceo-lobed, cellulari-corticate above, tomentose beneath ; 

 gonimia moniliform. Apothecia Iccanorine ; spores Bubcllip.soid, 

 murali-divided. 





'SCO 



Fig. 19. 



Lepfogivm safurnimim Kyi.— a. Vertical section of 

 a superficial portion of the tomentose thallus, 

 X 275. b. Sterigniata, and c, spermatia, X 275. 



17. L. saturni- 

 num Nyl. 8yn. i. 

 (1858) p. 127. ~ 

 Thallus large, sub- 

 monophyllous and 

 lobato-incised, or 

 polyphyllous and 

 fsinuato-lobed, roun- 

 ded and entire at 

 the margins, olive- 

 or leaden-brown, 

 above smooth or 

 slightly furfurace- 

 ous, beneath greyish 

 and densely tomeji- 

 tose. Apothecia moderate, plane, reddish-brown, thalline receptacle 

 cupular and somewhat prominent, margin thin, entire; spores ellip- 

 soid, 3-septate, becoming irregularly murali-multilocular, 0,020- 

 22 mm. long, 0,010-11 mm. thick.— Cromb. Lich. Brit. p. 9; 

 Leight. Lich. ¥1. p. 29, ed. 3, ]). 32. — Mallotium satunrivum Gray, 

 Nat. Arr. i. p. 399 ; Mudd, Man. p. 44. Collenia satuminum Hook. 

 Fl. Scot. ii. p. 71 ; Sm. Eng. Fl. v. p. 211. Lichen saturninus Dicks. 

 Crypt, fasc. ii. (179u) p. 21, t. 6. f. 8 ; With. Arr. ed. 3, iv. p. GO ; 

 Eng. Eot. t. 1980. — Brit. Ears. : Cromb. n, 5 ; Dicks. Hort. Sic. 

 n. 24. 



Though elsewhere a large plant, spreading exten.sively with firm thal- 

 , lus, with us it is smaller, thinner, and less polyphyllous. In damp shady 

 situations it often becomes blackish above when dry, contrasting with the 

 colom- of the under surface. When smaller and furiuraceous it resembles 

 Collema Jlaccidum, from which it may always be recognized by the 

 minutely cellular cortical layer, and by the whitish down of the under 

 surface. The apothecia are very rare in Britain. 



Hah. On the trunks of old trees, generally ash, by streams in upland 

 mountainous districts. — Distr. Local and scarce in the 15. and W. Ilio^h- 



