412 LICHENACEI. [leCANOBA. 



Disfr. Extremely rare on one of the S. Grampians, Scotland. — B. M. : 

 Beu Lawer.s, Perthshire. 



90. L. Parisiensis Xyl. Bull. Soc. Bot. t. xiii. (1866) p. 368.— 

 Thallus determinate or subdeterminate, rugose or rugose-granulate 

 or subverrucose, greyish (K-|- yellowish, Cat'l — ). Apothecia mode- 

 rate, plane, brownish-black or rarely brown, naked or occasionally 

 cassio-pruinose ; the thalline margin rugose or subcrenate ; para- 

 physes distinctly articulate, slightly thickened and brownish at the 

 apices ; spores 0,010-18 mm. long, 0,006-8 mm, thick ; hymenial 

 gelatine bluish (the thecae at length violet) with iodine. — Crorab. 

 Journ. Bot. 1871, p. 178. — Lecanora suhfusca forma Parisiensis 

 Leight. Lich. Fl. p. 201, ed. 3, p. 185.— In Flora, 1883, p. 107, 

 Ny lander says that Lecanora suhfmca c. horiza Ach. Lich. Univ. 

 (1810) p. 394, belongs pro parte (?'. e. the French specimen) to this 

 species, so that probably it ought to be called L. horiza (Ach.) 

 iS^yl. — Brit. E.rs. : Leight. n. 116 pro parte ; Larb. Lich. Hb. 

 n. 58. 



Distinguished from its more immediate British allies by the jointed 

 paraphyses. At times the thallus is small aud distinctly limited by a 

 white hypothallus, and is then probably the var. horiza Ach. The apo- 

 thecia occasionally are partly conglomerate, smaller, with the thalline 

 margin subevanescent, a state which may be L. suhfusca e. rufa Ach. Syn. 

 p. 157. The spermogones {Jide Nyl. in lift.) have the spermatia 0,018- 

 28 mm. long. 



Hab. On trunks of trees, seldom on old pales, in maritime and upland 

 tracts. — Distr. Not unfrequent in England ; rare in S. Ireland ; not seen 

 from Scotland or the Channel Islands. — B. M. : "NValthamstow, Essex ; 

 Glynde, Sussex ; New Forest, Hants ; near Shauklin, Isle of "Wight ; 

 Ils'ham, Torquay, and near Bovey Tracey, S. Devon ; Cherry Hinton, 

 Cambridgeshire ; Gopsall Park, Leicestershire ; Barmouth, Merioneth- 

 shire ; near Shrewsbury, Shropshire ; near Ayton, Cleveland, Yorkshire. 

 Tullygreen, co. Cork. 



91. L. rugosa Xyl. Flora, 1872, p. 250, nota 2. — Thallus deter- 

 minate, thickish, granulato-rugose, whitish (K-f- yellowish, CaCl — ). 

 Apothecia moderate or somewhat large, at first concave, then plane, 

 pale or brownish, sometimes slightly pruinose ; the thalline margin 

 thick, elevated, rugose or rugoso-crenate and inllexed ; paraphyses 

 crowded, colourless; epithecium granulose ; spores 0,010-18 mm. 

 long, 0,007-10 mm. thick; hymenial gelatine bluish, then wine-red 

 with iodine. — Cromb. Grevillea, xviii. p. 68. — L. suhfusca form 

 rufjosa Cromb. Lich. Brit. p. 51: Leight. Lich, Fl. p. 201, ed, 3, 

 p. 186. Lichen rugosus Pers. fiile Ach. Lich, Univ. (1810) p. 394 

 (sub L. suhfusca c. horiza). L. suhfusca e. atri/nea Mudd, Man. 

 p, 147 pro parte. 



May be recognized in its more typical state by the character of the 

 thalline margin of the apothecia, which, with the granul(_)se epithecium, 

 readily distinguish it from the preceding corticolous species. The apo- 

 thecia" are at times crowded and angidose, and when also suhju-uinose 



