LEPTOGIUII.] COLLFMEI. 77 



Land. New G.iUoway, Kirkcudbrif^htshire ; Johnstone, Molfiit, and llae 

 Hills, Dumfriesshire ; Inverary and Appin, .Vrgyleshire ; The Trosachs, 

 (lien Lochay, and Glen Falloch, Perthshire ; Lochab t, Inverness-shire. 

 Eagle's Nest, Cromaglown, Uinish, and Derrycuiiitry, Killarney, co. Kerry ; 

 Connemara, co. Gahvay. 



PsEUDO-GENtTS. 



17. DENDRISCOCAULON Xyl. Flora, 188.',, p. 209.— 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 spcrmo- 

 gones unknown. 



This pseudo-genus, as indicated by Nylander (Flora, 187<5, p. 578), is 

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

 and gonidic leprarioid thalli. In internal structui'e the furfuraceous 

 lacinife are somewhat like those of the subgenus Homodium. 



1. D. bolacinum Xyl. Flora, 1885, p. 299. — ThaUus csespifcose, 

 erect, branches compressed, isabelline : laciniiB crowded, leproso- 

 puMnate, dark greenish. — Cromb. Grevillea, xv. p. 13. — Homo- 

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

 f/iwn bolacinum^ Cromb. Jouru. Bot. 1876, p. 359. Collema atro- 

 ceruleum e. holacinum Schjier. (non Ach.) Enum. 1850, p. 249. 



According to Xylander (Stiz. Lioh. H^-perb. p. 6) this peculiar plant is 

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

 and constitutes the glomeruli of RicasoJia ghiniilifera. It resembles 

 Leptoffium lophcenm, and very rarely occurs gi-owing independently. 



Hab. 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, Aa'gyleshire ; near Taymouth, Pertli- 

 .shire. 



18. COLLEMOPSIS Xyl. Flora, 1S73, 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 conniveut; spores 

 8nje, ellipsoid, simple, colourless ; paraphyses usually simple, slender; 

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

 simplish sterigmata, and oblong minute spermatia. 



Nylander separated this genus from Pyrenopsis and placed it among-st 

 the CoUemei because of the texture and colour of the thallus and the sub- 

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

 Nyl. pro parte, Psorutichia Mass., Porocyphits Korb., Sec. "Of these, Psoro- 

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

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

 species very much resemble Pannidaria, but are distinguished by the 

 absence of a hypothallus. CoUemopsis evidently holds the same place 

 amonuf the Collemacei as Pannularia among the Lichenacei. 



