COLLEMA. | COLLEMET. 55 
t. 345, Lichen vespertilio Lightf. Fl. Scot. ii. p. 840. Lichenoides 
gelatinosum membranceum tenue nigricans Dill. Muse. p. 138, t. 19. 
£20. Lichenoides saxatile membranaceum gélatinosum tenue, nigres- 
cens Dill. in Ray, Syn. ed. 3, 72. 53.—Brit. Evs.: Leight. n. 109 ; 
Cromb. n. 104. 
This is readily recognized by the nearly monophyllous, rugose, thinnish 
thallus, lacunose beneath, and by the small crowded apothecia. The 
thallus, which is orbicular and appressed at the circumference, is not 
inaptly likened by Dillenius to a “ bat’s wing,” whence the specific name 
of ightfoot; when growing more luxuriantly it sends forth smaller 
lobes. Sometimes in old age it is nearly obliterated, only the smaller 
lobes with the apothecia being apparent, when it might be mistaken for 
the next species. The apothecia are chiefly central, and in otherwise 
barren specimens the spermogones are usually abundant. 
_ Hab. On the trunks of old trees, chiefly poplars and willows, in mari- 
time and upland wooded. districts.— Distr. General and not uncommon 
in the Channel Islands, Great Britain, and Ireland, but chiefly in the 
Western tracts.—B. M.: Noirmont, Rozel, and St. Quen’s Bay, Island 
of Jersey; Island of Guernsey. Near Ryde, Carisbrook Castle, and 
Shanklin, Isle of Wight; Fairlight Glen, Hastings, Henfield, Hurstpier- 
pent and Beeding, Sussex; Torquay, Paignton, Sidmouth, Totnes, 
olt Head, and Cornworthy, Devonshire; Boconnoc, near Penzance, 
and the Lizard, Cornwall; Kemble, near Cirencester, Gloucestershire ; 
Barrow Hill, Malvern, and Broadwas, Worcestershire; Aberdovey, 
Merionethshire ; near Guisboro’, Cleveland, Yorkshire. New Galloway, 
Kirkeudbrightshire ; Barcaldine, Argyleshire ; near Callander, Loch Tay, 
and in Glen Lochay, Perthshire; Glen Dole, Forfarshire; Gairloch and 
Applecross, Ross-shire. Castlemartyr, co. Cork; Powerscourt, co. Wick- 
low; Killarney and Muckross, co. Kerry. 
22. C. aggregatum Nyl. Mém. Soc. Sc. Nat. Cherb. ii. (1854) 
p. 318; Syn. i. p. 115, t. ii. f. 9.—Thallus small, lobate and plicate, 
somewhat rigid, difform, greenish-black or olive-brown (I+ red) ; 
lobes rather short, sometimes crenate, and often granuloso-crispate 
at the margins, Apothecia moderate, crowded, plane or slightly 
convex, red or dark-red, the thalline margin thin, entire; spores 
rarely 6ne, fusiformi-cylindrical, straight or curved, pluri-septate, 
0,033-65 mm. long, 0,004-5 mm. thick.—Cromb. Lich. Brit. p. 6; 
Leight. Lich. Fl. p. 26, ed. 3, p. 25.—Synechoblastus agqregatus 
Mudd, Man. p. 48. Enchylium fasciculare B. aggregatum Gray, Nat. 
Arr. i. p. 398. Collema fasciculare var. aggregatwm Ach, Lich. Univ. 
(1810) p. 648. Lichenoides gelatinosum palmatum, tuberculis con- 
glomeratts Dill. Muse. 141, t. 19. f. 273.—Brit. Hxs.: Cromb. 
n. 105. 
From the closely allied C. nigrescens this is distinguished by the thallus 
being much smaller, more rigid, and not radiately rugose, and by the 
shorter, not rounded nor appressed lobes. It is occasionally leaden- 
coloured when dry, and often but little developed. The apothecia in 
fertile specimens are usually numerous and crowded. 
Hab. Among mosses on the trunks of old trees in wooded upland 
tracts.—Distr. Found only in 8., W., and N. England, N. Wales, the 
W. Highlands of Scotland, and 8.W. Iveland.—B. M.: High Rocks, 
