LEPTOGIUM.] COLLEMEI. 77 



land. New Galloway, Kirkcudbrightshire; Johnstone, Moffat, and Rae 

 Hills, Dumfriesshire ; Inverary and Appin, Argyleshire ; The Trosachs, 

 Glen Lochay, and Glen Falloch, Perthshire ; Lochaber, Inverness-shire. 

 Eagle's Nest, Cromaglown, Dinish, and Derrycuintry, Killarney, co. Kerry ; 

 Connemara, co. Galway. 



PSEUDO-GENUS. 



17. DENDRISCOCAULON Nyl. Flora, 1885, p. 299. Thallus 

 fruticulose, much branched, the axis solid, branches covered towards 

 the apices with minutely divided furfuraceous laciniae, containing 

 gonimia, which are more or less scattered. Apothecia and spermo- 

 gones unknown. 



This pseudo-genus, as indicated by Nylander (Flora, 1870, p. 578), is 

 only a leprarioid condition of " Leptogium," so that we have both gonimic 

 and gonidic leprarioid thalli. In internal structure the furfuraceous 

 laciniae are somewhat like those of the subgenus Homodium. 



I. D. bolacinum Nyl. Flora, 1885, p. 299. Thallus caespitose, 

 erect, branches compressed, isabelline ; lacinise crowded, leproso- 

 pulvinate, dark greenish. Cromb. Grevillea, xv. p. 13. Homo- 

 dium bolacinum Cromb. Journ. Linn. Soc., Bot. xvi. p. 228. Lepto- 

 gium bolacinum, Cromb. Journ. Bot. 1876, p. 359. Collema atro- 

 cceruleum e. bolacinum Schaer. (non Ach.) Enum. 1850, p. 249. 



According to Nylander (Stiz. Lich. Hyperb. p. 6) this peculiar plant is 

 identical with Cornicularia Umhauensis Auersw., Hedwigia, 1869, p. 113, 

 and constitutes the glomeruli of Ricasolia glomulifera. It resembles 

 Leptogium lophesum, and very rarely occurs growing independently. 



Hub. Among mosses on old trees, rarely on rocks, in upland tracts. 

 Distr. As an independent plant very local and scarce in the S. Highlands 

 of Scotland. B. M. : Barcaldine, Argyleshire ; near Taymouth, Perth- 



18. COLLEMOPSIS Nyl. Flora, 1873, p. 17 (note), cfr. Cromb. 

 Journ. Bot. 1874, p. 332. Thallus crustaceous, thin, granulato- 

 areolate, more or less loosely affixed to the substratum, glaucous- 

 green within; gonimic granules submoniliform. Apothecia urceo- 

 lato-innate, small, the margin usually tumid and connivent; spores 

 8n?e, ellipsoid, simple, colourless ; paraphyses usually simple, slender; 

 hymenial gelatine bluish or wine-red with iodine ; spermogones with 

 simplish sterigmata, and oblong minute spermatia. 



Nylander separated this genus from Pyrenopsis and placed it amongst 

 the "Collcmei because of the texture and colour of the thallus aud the sub- 

 moniliform gouimia. It embraces various genera of authors, as Pyrenopsis 

 Nyl. pro parte, Psorotichia Mass., Porocyphw Kbrb., &c. "Of these, Psoro- 

 tichia, had it not been inf ormal (for it should evidently have been written 

 Tichospora), ought probably to have been preserved " (Nyl. in litt.). Some 

 species very much resemble Panmdaria, but are distinguished by the 

 absence of a hypothallus. Collemopsis evidently holds the same place 

 among the Collemacei as Pannularia among the Lichenacei. 



