NEW EAHE OE CRITICAL LICHEXS 207 



much importance to the septatioii and discreteness of the paraphyses 

 and the amount of inspersion of the epithecium with granules. 

 Modern students find that there is a fair amount of variation in these 

 internal characters, and that too much importance has been attached 

 to them during the determination of species. The nomenclature of 

 Hue corresponds fairly well with that given in Crombie's Monogi-aph, 

 though some species are reduced to varieties or forms, whilst some 

 varieties are raised to specific rank. 



L. suhfusca (L.) Nyl. The tj^pe (f. typica Hann.) is not un- 

 common in Somerset. Yar. glahrata Ach. occurs at Porlock and 

 Taunton (5). 



L. chlarona iovm geograpliica (Mass.) Nyl. Stoke St. Mary and 

 Memdge near Bridgwater (5). Similar forms have been found for 

 L. suhfusca^ L. alhella and L. intumescens, at Aisholt (5). Miss A. 

 Lorrain Smith and Mr. Hebden kindly tested these forms. 



X. atrynea (Ach.) Nyl. Thurlbear (5), Benderloch (98, T. 

 Hebden). 



L. gangaleoides form glehidosa Harm. Llanberis (49). 

 L. intumescens (Reb.) Krb. Chard, Horner and Aisholt (5). 

 L. alhella (Pers.) Ach. is fairly frequent in Somerset. — ^Form 

 suhalhella Nyl. Castle Gary (6). — Form peralhella Nvl. Staple 

 hill (5). 



L. campestris (Schaer.) Nyl. Form detrita (Harmand, p. 976), 

 with the apothecia aborted or altered, seems to be more frequent in 

 this species than in the other members of the suhfusca group. 



L. glaucoma form complanata Leight. On Lynton slate wall, 

 Merridge near Bridgwater (5). 



L. iimhrina (Ehrh.) Mass. On rock, Taunton (5). — Yar. Hageni 

 (Ach.) Cromb. Crowcombe and Minehead (5). 



L. cremilata (Dicks.) Nyl. On limestone walls and cement, Taun- 

 ton (5), Mendip (0), Magnesian limestone wall, South Milford (64). 

 L. varia (Ehrh.) Ach. is not uncommon on the stems of ling. 

 L. conizcea (Ach.) Nyl. Alcombe and Exton (o). 

 Li. symmicta Ach. is distinguished from the commoner i. expallens 

 by its more determinate thallus, and the absence or little distinctness 

 of the thalline margin to the apothecium. Quantock Combes, Exmoor 

 Staple hill and Puckington (5), High Ham ^6). 



L.suhtartarea Nyl. Harlech (48), Llanberis (49), Ben Lui (87) 



Lecania erysihe form cinereofusca (Mudd). On calcareous rock, 



Brean Down (6). — Yar. proteiformis (Mass.) = var. Sahenhorstii 



(Hepp.) Oliv. On top of calcareous wall near Taunton {teste T. 



Hebden) and Crowcombe (5). 



Binodina confragosa (Ach.) Massal. On sarsen stone, Fifield (8). 

 B. umhrinofusca (Nyl.). On rock of river wall, Burnham (6), 

 teste T. Hebden. 



Aspicilia cinerea (Ach.) Krb. is the dominant lichen on the 

 shingle at Greenaleigh Point near Minehead (5). 



A. gihhosa (Dicks.) Krb. On sarsen stone, Codford (8); on beach 

 shingle, Pevensey (13). 



A. Dicksonii (Ach.) A. L. Sm. is a rather frequent plant of 

 mountain regions. Horner (5 i, Llanberis (49). 



