XEW EAEE OR CRITICAL LIGHEXS 209 



Ravens. The colouration is, however, more definite and the para- 

 physes are more distinct and discrete than in L. i^arasema. On old 

 pales, Staple hill (5), High Ham (6). 



L. parasema YSir.Jlavens Nyl. On trunks of trees, Braunton (4), 

 Stoke St. Maiy and Treborough (5). — Var. tahescens (Krb.) Leight. 

 has a greater value than that of a form, and almost seems worthy of 

 a specific rank, owing to the indistinctness of the hypothallus and the 

 colour of the apothecia. The reactions of the thallus are variable in 

 the same specimen, the apothecia may be livid brown, dark-brown, 

 dark reddish or dark greenish-blue, and the tips of the paraphyses 

 may not have the bluish tinge characteristic of L. 'parasema. On 

 trees and pales, Brendon Hill and Holway, near Taunton (5). 



L. suhlatypea Leight. Cheddon Fitzpaine (5). 



L. arctica Somm. On mosses at 3700 feet, Ben Lui (87 and 88), 

 also seen on Ben Lawers in 1913. 



L. corolUda Stirt. On rock near Washford (5). Mr. Hebden 

 agrees with my determination, and says that the thallus " suggests a 

 depauperate condition such as occurs in many other lichens." 



L. contigva (Hoffm.) Fr. The forms limiiaia Leight. Jeprosa 

 Leight. nohilis (F]\) Leight. Hoffmanni Leight. are general and 

 common. — Yorm. piistulata Leight. Blagdon hill (5). — Var, calcarea 

 Fr. The varietal name is not suggestive of the habitat but of the 

 creamj^-white colour. The apothecia at first are more or less innate. 

 On siliceous rock, near Koadwater (5). — Var. percontigua (Nyl.) 

 A. L. Sm. Morthoe (4). — A^ar. ylatycarpa (Ach.) Fr. Quantocks 

 (5), Harlech and Cwm Bvchan (48), Llanberis (49), Nant-v-Ffrith 

 (50), Ffrith (51), Greenfield (63), Ben Lui (87), Tyndrum and 

 Killin (88). — Form liydrophila (Fr.). The thallus has a milky 

 colour and the apothecia are more tumid and convex. On Avater- 

 washed rocks, Quantocks (5), Greenfield (63), Loch Tulla (98). — 

 Var. JJavicuuda (Ach.) Nyl. Common on rocks in hilly regions. 

 Harlech and Cwm Bychan (48), Llanberis (49), Ben Lui (87), Killin 

 and Tyndrum (88). 



L. sorediza Nyl. Hodder s Combe (5), Bleadon (6), Ben Lui 

 (87 and 88). — Form depai(perata Cromb. Bleadon (5). 



L. crustulata (Ach.) Krb. Castle Neroche and Dunkery (5), 

 near Oswestry (40, T. Hebden), Snowdon (49), Ben Lui (87), Tyn- 

 drum and Killin hills (88). The form fusceUa (Mudd) A. L. Sm. 

 is the common one and usually occurs on hard siliceous rocks. 



L. sympatlwtica Tayl. Stoke St. Mary, Thurlbear and East 

 Quantoxhead (5). The habitat of this plant is usually given as sand- 

 stone, but ni}' sp'- imens occur on White Lias rocks, walls and stones. 

 Mr. Hebden also finds the plant on a calcareous substratum. The 

 tlialline reactions are K — C — . 



L. confiuens form oxydata Leight. Kecorded from Ben Lawyers 

 and seen there in 1913. 



i. tessellata Flk. On rocks over 3500 feet, Ben Lui (87 and 88). 

 Seen on Ben Lawers in 1913. 



L. fuscoatra (L.) Ach. Tyndrum and Killin hills (88), Ben 

 Doran (98). ... 



X. Kochiana Hepp. On boulders in E. Glaslj^n (48). 



