RICASOLIA. ] STICTEI. 275 
sorediiferous ; beneath with fasciculate rhizine, or sometimes nearly 
glabrous, very rarely with cyphelle; gonidial layer composed of 
gonidimia. Apothecia parmeleine, usually scattered; spores vari- 
ously fusiform, septate. Spermogones in mastoid prominences, with 
jointed sterigmata ; spermatia shortly cylindrical, somewhat thick- 
ened and obtuse at either apex. 
Distinguished from the preceding genera of the tribe by the fasciculate 
rhizinw, the nature of the gonidia, and the situation of the spermogones. 
Most of the species are natives of equinoctial regions ; of the three which 
occur in Europe two are plentiful in our Islands, 
1. R. amplissima Leight. Lich. Fl. (1871) p. 120.—Thallus orbi- 
cular, expanded, rigid, opaque, smooth or rugose in the centre, 
glomuliferous, laciniato-divided, glaucous-green or pale-brown, 
laciniz crowded, sinuato-lobed ; beneath pale, with brownish rhizine, 
cyphelle none (K+3*wish, Cac] —). Apothecia large, concave, or 
at length plane, reddish, the margin entire, inflexed or granulate ; 
spores elongato-fusiform, (1—)3-septate, colourless, 0,32-60 mm. 
long, 0,006-7 mm. thick.—Leight. Lich. Fl. ed. 3, p. 112.—Lichen 
amplissimus Scop. Fl, Carn. ii. (1772) p. 386. Ricasolia glomu- 
lifera Cromb. Lich. Brit. p. 32. Sticta glomulifera Mudd, Man. 
p. 91. Purmelia glomulifera Gray, Nat. Arr. i. p. 436; Hook. Fl. 
Scot. ii. p.52; Sm. Eng. Fl.v. p.198. Lichen glomuliferus Lighté. 
FL. Scot. ii. (1777) p. 853; With. Arr. ed. 3, iv. p. 57; Eng. Bot. 
t. 293. Lichen laciniatus Huds. Fl. Angl. (1762) p. 449. Lachen- 
oides subglaucum cumatile, foliis tenacibus, eleganter luciniatis Dill. 
Muse. 197, t. 26. f. 99.—Hudson’s specific name has priority, but 
having fallen into oblivion is not adopted.—Brit. Hws.: Leight. 
n. 110; Larb. Cesar. n. 62; Cromb. n. 138. 
One of the largest lichens, spreading in favourable situations exten- 
sively, and_scmetimes enveloping a large portion of the trunks of trees 
with an unbroken covering. It is easily recognized by the almost con- 
stant presence of the dark-green glomeruli of Dendriscocaulon bolacinun 
on the upper surface of the thallus, The apothecia are somewhat rare, 
but are generally abundant when present, Occasionally they are abortive, 
small and crowded, appearing as if cephalodine. The spermogones in 
otherwise sterile plants are frequent, prominent, the ostiole brown, with 
spermatia 0,005 mm. long, about 0,001 mm. thick. 
Hab. On the trunks of old trees, chiefly ash and oak, rarely on rocks in 
maritime and upland districts —Dvzstr. Not very general, though usually 
lentiful, chiefly in the western tracts of Great Britain; rare in S.W. and 
iS Ireland and in the Channel Islands.—B. M.: Near Rozel, Island of 
Jersey; Jerbourg, Island of Guernsey; Chateau Point, Island of Sark. 
New Forest, Hampshire; Manaton Moor, Brent Tor, and Ivy Bridge, 
Devonshire; Boconnoc and near Launceston, Cornwall; Llantorda, near 
Oswestry, Shropshire ; Hafod, Cardiganshire ; near Delgelly, Barmouth, 
Aberdovey, and Llanbedr, Merionethshire ; Island of Anglesea; Sedburgh 
and Windermere, Westmoreland; Horsleyhope Denes, Durham; Kes- 
wick, Cumberland. New Galloway, Merkendonghtahiae: Minto Crags, 
Roxburghshire ; Mugdock Castle, near Glasgow ; Loch Long, near Ros- 
neath, Inverary, and Barcaldine House, Argyleshire; Loch Katrine, Glen 
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