448 LICHTIXACEI. [LFOANORA.. 



140. L. syringea Ach. Vet. Ak. Handl. 1810, p. 75 : Lich. Univ. 

 p. 368. Thallus effuse, very thin, or scarcely any visible, glaucous 

 or greyish-white (K , CaCl ). Apothecia small, sessile, at first 

 plane with thin, entire thalline margin, then convex and immargi- 

 nate, brownish or brownish-black, naked, or slightly caesio-pruinose ; 

 paraphyses not discrete, brownish at the apices; spores 8-16nae, 

 oblong, or elliptico-oblong, obtuse at the apices (l)-S-septate, usually 

 somewhat curved, 0,012-16 mm. long, 0,004-6 mm. thick ; hyme- 

 nial gelatine bluish, then wine-red or violet with iodine. Cromb. 

 Grevillea, xviii. p. 78. Parmelia Hageni /D. syringea Ach. Meth. 

 (1803) p. 163. Lecanora athroocarpa Dub. Cromb. Lich. Brit. p. 53 

 pro parte ; Leight. Lich. Fl. p. 231 pro parte, ed. 3, p. 223 pro 

 parte. Z-. aihroocarpa var. fuscella (Schaer), Cromb. Lich. Brit. 

 1. c. ; Leight. Lich. Fl. p. 232, ed. 3, I c. Lecania fuscella Mudd, 

 Man. p. 140 (corticola), t. ii. f. 45. 



Though the specific name of Acharius is more circumscribed and refers 

 rather to a form of L. aihroocarpa Dub. (Bot. Gall. ii. p. 669), it 

 may on the ground of priority be retained. The plant is somewhat 

 variable, at times not unlike L. Hageni and again resembling some 

 Lecidea near L. vernalis, according to the character of the apothecia. 

 These are often crowded, and are then more or less biatoroid. 



Hob. On the trunks and branches of trees, chiefly poplar and maple, 

 in maritime and upland tracts. Distr. Only very sparingly in S. and W. 

 England. B. M. : Near Brading, Isle of Wight; Glynde, Sussex ; Brocken- 

 hurst and near Stoney Cross. New Forest, Hants ; Ilsham, near Torquay, 

 S. Devon ; near the Beck, Malvern, Worcestershire. 



Form metabolica Nyl. Lich. Scand. (1861) p. 169 (sub L. athroo- 

 carpa). Thallus very thin, whitish or greyish-white. Apothecia 

 minute, biatorine, dark-brown or nearly black. L. athroocarpa 

 var. metabolica. Cromb. Lich. Brit. p. 53 ; Leight. Lich. Fl. p. 232, 

 ed. 3, p. 224. Lecanora metabolica Ach. Lich. Univ. (1810) p. 351. 



Only a form with smaller, darker, more constantly biatorine apothecia. 

 These in our specimens are also more scattered than in the type, with 

 which probably it is confluent. 



Hub. On trunks and branches of maple in maritime districts. Distr. 

 Extremely local in the Channel Islands and S. England. B. M. : 

 Trinity, Island of Jersey. Brading, Isle of Wight. 



141. L. Nylanderiana Nyl. ex Norrl. Sallsk. pro F. et Fl. Fenn. 



i. (1876) p. 24. Thallus effuse, granulato-unequal, rimoso-areolate, 

 sordid-greyish-white (K , CaCl ). Apothecia subrnoderate, at 

 first plane with thin thalline margin, at length convex and often 

 immarginate, brown or brownish-black, glauco-pruinose or occa- 

 sionally naked; spores 8nae, 3-septate, oblong or subfusiform, 

 straight (very rarely slightly curved), 0,014-20 mm. long, 0,0045 

 mm. thick; paraphyses jointed, brownish at the thickened apices ; 

 hymenial gelatine bluish, then wine-red with iodine. Lecania 

 Nylanderiana Mass. Sched. crit. (1855) p. 152. L. ccerulescens 

 Mudd, Man. p. 140, t. 2. f. 46. Lecanora atliroocarpa form cceru- 



