412 LICHENACEI. [LECANORA. 



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

 Ben Lawers, Perthshire. 



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

 Thallus determinate or subdeterminate, rugose or rugoso-granulate 

 or subverrucose, greyish (K-f yellowish, CaCl ). Apothecia mode- 

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

 csesio-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 thecaa at length violet) with iodine. Cromb. 

 Journ. Bot. 1871, p. 178. Lecanora subfusca forma Parisiensis 

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

 Nylander says that Lecanora subfusca 1. horiza Ach. Lich. Univ. 

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

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

 Nyl. Brit. Exs. : 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 and 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. subfusca e. rufa Ach. Syn. 

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

 28 mm. long. 



Hob. 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. : Walthamstow, Essex ; 

 Glynde, Sussex ; New Forest, Hants ; near Shanklin, Isle of Wight ; 

 Ilsham, 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 Nyl. Flora, 1872, p. 250, nota 2. Thallus deter- 

 minate, thickish, granulato-rugose, whitish (K + 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 inflexed ; 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. subfusca form 

 rugosa Cromb. Lich. Brit. p. 51; Leight. Lich. Fl. p. 201, ed. 3, 

 p. 186. Lichen rugosus Pers. fi<le Ach. Lich. Univ. (1810) p. 394 

 (sub L. subfusca <). horiza). L. subfusca e. atrynea 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 granulose epithecium, 

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

 thecia are at times crowded and anguluse, and when also 



