LEPTOGIUM | COLLEMACEX: 69 
Leight. Lich. Fl. 24. C. multipartitum var. fluviatile Tay]. in 
Mackay Fl. Hib. ii. p. 109 (1836). Enchylium fluviale S. F. 
Gray Nat. Arr. i. p. 397 (1821). Collemodium fluviatile Nyl. ex 
Cromb. in Grevillea xv. p. 12 (1886) & Monogr. i. p. 60. 
Distinguished from L. plicatile by the thinner more extended 
lobes, and by the habitat. Very few of the British specimens are 
fertile. Collema rivulare Ach. Syn. Lich. p. 326 (1814) is partly 
identical with this species. The lobes of a specimen from Lanark in 
Hb. Borrer have hairs on the under surface. The cellular cortex is 
often indistinct. 
Hab. On moist rocks and boulders in streams mostly in up- 
land situations.—Distr. Rare in W. and N. England, N. Wales, 
S.W. and Central Scotland and $.W. Ireland.—B. M. St. Minver, 
Cornwall; East Lyn River, Devon; River Elwy, Denbighshire ; 
Snowdon, Carnarvonshire; Falls of the Clyde near Lanark; near 
Leven, Fifeshire; River Isla near Ruthven Wood, and Loch Earn, 
Perthshire; Ardtully, Kenmare, Kerry. 
Cortical cells more fully developed (Hu-Leptogium). 
Thallus granular ; growing on rocks or mortar. 
7. L. glebulentum Nyl. ex Cromb. in Journ. Bot. xx. p. 272 
(1882).—Thallus thickly isidiose, with small subentire or lacerate 
lobes at the circumference, olive-brown or blackish. Apothecia 
and spermogones unknown. Collemodium glebulentum Nyl. ex 
Cromb. in Grevillea xy. p. 12 (1886) & Cromb. Monogr. i. p. 61. 
Of doubtful position owing to the absence of fructification. The 
isidia are in thick cushion-like masses. The cellular cortex is well 
developed. 
Hab. On moist limestone rocks in alpine localities. B. M. Above 
Loch-na-gar, Ben Lawers, Perthshire; Craig Grue, Braemar, Aberdeen- 
shire. 
8. L. rhyparodes Nyl. in Flora xlviii. p. 210 (1865).— 
Thallus diffuse, thin, furfuraceous or granular and unequal, 
cracked, brownish-red or blackish-brown (I + wine-red). Apo- 
thecia small, at first concave, becoming plane, with the margin 
excluded, reddish- or brownish-black ; spores ovoid, septate and 
muriform, 20-38 p» long, 11-16 » thick.—Carroll in Journ. Bot. 
iii. p. 287 (1865); Cromb. Lich. Brit. p. 7; Leight. Lich. Fl. 
p- 35; ed. 3, p. 26. Collema psorellum Nyl. in Flora xlviii. 
p. 602 (1865); Carroll in Journ. Bot. iv. p. 22 (1866) ; Cromb. 
Lich. Brit. p. 3 & in Journ. Bot. xii. p. 335 (1874); Leight. 
Lich. Fl. p. 26. 
The thallus sometimes spreads extensively and is occasionally 
almost evanescent. On moist shady rocks the thallus is less developed 
(Coliema psorellwm). 
Hab. On schistose rocks in subalpine and alpine localities.—Distr. 
Local and rare among the 8S. Grampian’, Scotland.—B. M. Craig 
Calliach, above Loch-na-gar and the summit, Ben Lawers, and Glen 
Lyon, Perthshire. 
