RICASOLIA.] STICTEI. 275 



sorediiferous ; beneath with fasciculate rhizinae, or sometimes nearly 

 glabrous, very rarely with cyphellae ; 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 

 rhizime, the nature of the gonidia, and the situation of the spermogones. 

 Most of the species are natives of equinoctial regions j 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-dmded, glaucous-green or pale-brown, 

 lacinia? crowded, sinuato-lobed ; beneath pale, with brownish rhizinae, 

 cyphellae none (K^ ye OW1S ' CaCl ~). Apothecia large, concave, or 

 at length plane, reddish, the margin entire, indexed or granulate ; 

 spores elongato-fusiform, (l~)3-septate, colourless, 0,32-60 mm. 

 long, 0,006-7 mm. thick. Leight. Lich. Fl. ed. 3, p. 112. Lichen 

 am^lissimus Scop. Fl. Cam. ii. (1772) p. 386. Kicasolia glomu- 

 lifera Cromb. Lich. Brit. p. 32. Sticta glomulifera Mudd, Man. 

 p. 91. Parmelia glomulifera Gray, Nat. Arr. i. p. 436 ; Hook. Fl. 

 Scot. ii. p. o2; Sm. Eng. Fl. v. p. 198. Lichen glomuliferus Lightf. 

 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. Lichen- 

 aides subglaucum cumatile, foliis tenacibus, eleganter laciniatis Dill. 

 Muse. 197, t. 26. f. 99. Hudson's specific name has priority, but 

 having fallen into oblivion is not adopted. Brit. Exs. : Leight. 

 n. 110 ; Larb. Cjesar. n. 62; Cromb. n. 138. 



One of the largest lichens, spreading in favourable situations exten- 

 sively, and sometimes 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 bolacinum 

 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 spermogunes in 

 otherwise sterile plants are frequent, prominent, the ostiole brown, with 

 spermatia 0,005 mm. long, about 0,001 mm. thick. 



Hob. On the trunks of old trees, chiefly ash and oak, rarely on rocks in 

 maritime and upland districts. Distr. Not very general, though usually 

 plentiful, chiefly in the western tracts of Great Britain ; rare in S.W. and 

 N. Ireland and in the Channel L-lands. 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 ; Llanlbrda, near 

 Oswestry, Shropshire ; Hafod, Cardiganshire ; near Dolgelh , Barmouth, 

 Aberdovey, and Llanbedr, Merionethshire ; Island of Auglesea; Sedburgh 

 and Windermere, Westmoreland ; Horsleyhope Denes, Durham ; Kes- 

 wick, Cumberland. New Galloway, Kirkcudbrightshire ; Minto Crags, 

 Roxburghshire ; Mugdock Castle, near Glasgow ; Loch Long, near Ros- 

 neath, Inverary, and Barcaldine House, Argyleshire ; Loch Katrine, Glen 



