38 THK LICHEN FLORA OF QUEENSLAND, 



1. P. polydac'yla, Hoffm. 



Thallus prostrate, smooth or shining above, membranaceous, 

 brownish-green or greyish, subtomentose ; below spongiose, 

 whitish, reticulated with pale brown veins, which generally 

 give off' vertical fibrils, and surround interstitial, longitudinal, 

 whitish lacunae ; fertile lobules narrow, often very numer- 

 ous and somewhat digitately arranged. Apothecia chestnut- 

 coloured, at first involute in the margins of the thalline 

 lobes, affixed vertically to the produced and ascending 

 Sn. lobules, orbicular, becoming-elongated, finally with revolute 

 margins ; back of receptacle sub-verrucose, tomentose ; 

 spores 8, narrowly fusiform, colourless, 3 — 7 septate, *09 — 

 •11 x -009 — -Oil m.m. ; paraphyses discrete ; spermatia 

 obovate, obtuse ; stylospores simple, oblong or oblong- 

 fusiform, -007— -012 x -003— -004 m.m. 



Syn. — Peltidea polydactyla, Ach, 



Tribe XIII. — Physciei, Nyl. 



Thallus yellow or cinereous or very rarely fuscescent, laciniate 

 or lobate, usually stellate-orbicular, rarely ascending, fruticu- 

 lose or subterete. Apothecia golden, or yellow, or brown, or 

 black ; paraphyses discrete ; spores either colourless or brown, 

 bilocular or rarely quadrilocular. Spermagonia with pluri- 

 articulate sterigmata or arthrosterigmata ; spermatia oblong- 

 cylindrical or uniformly cylindrical, in some species slightly 

 incrassate at both ends. Cellular stratum of true gonidia. 

 Nyl. Syn. Lich, p. 406. Vol. I. 



I. — Physcia, Nyl. 



Thallus spreading, foliaceous, membranaceous or coriaceoui, 

 linear laciniate or lobed ; upper surface often shining ; under snr- 

 face fibrillose, differing in colour from upper surface, and canalicu- 

 late beneath the laciniac. Apothecia scutellate, subpedicellate, 

 terminal or lateral, with a thalline border : disk always open, bare 

 or pruinose, varying in colour, and not concolorous with the thallus. 

 Paraphyses separate ; spores rarely simple, usually 2-locular. 



Flavescentes (Xanthoria, Fr.f.) 



