128 LICHEXACEI. [CLADONIA. 



laciniaj. States, however, occur, as if intermediate between them, in 

 which these characters are not so evident. "With us it is rare in a fertile 

 condition. The podeti.i are occasionally wanting, and then the apothecia 

 and the spermogones are sessile on the laciuia;. 



Hab. In dry sandy places amongst mosses and heaths in maritime and 

 upland districts. — Distr. Here and there throughout Great Britain, chiefly 

 in S. England and the Channel Islands ; rare in S.W. Ireland. — B. M. : 

 Quenvais, Island of Jersey ; Island of Sark ; Jerbourg, Icart Point, and 

 L'Ancresse Bay, Island of Guernsey. Hunstant<in, Norfolk; Aldgravp, 

 Snftolk : Eppiug Forest, Essex ; the Downs, near Brighton, Sussex ; Isle 

 of Wight; near Torquay, S. Devon; Withiel and the Scilly Islands, 

 Cornwall : Malvern Hills, Worcestershire ; Charuwoud Forest, Leicester- 

 shire ; Hanghmoud Hill, Shropshire ; Barmouth and Anglesea, X. Wales : 

 near Great" Aytou, Cleveland, Yorkshire. Pentland Hills, Edinburgh ; 

 Island of Lismore ; Bay of Nigg, Kincardineshire ; the Links, Old Aber- 

 deen. Glengarift', co. Cork. 



3. C. firrna Xyl. Bull. Soc. Bot. Fr. viii. (1861) p. 755.— Thallus 

 laciuiato-squamose at tlie base ; lacinia? constipate, suberect, very 

 minutely subareolato-insculpt, firm, crenate, naked, or at times 

 fibrillose at the margins, and crenato-incised, yellowish or glaucous- 

 greenish above, beneath pale yellowish or whitish or obsoletely 

 rose-coloured and white-suffused ; podetia small, narrowly scyphi- 

 ferous (K— , K(CaCl) -1- yellow, often ferrugincous). Apothecia more 

 or less confluent, brown. — Cromb. Grevillea, xi. p. 111. — Cladonia 

 alcicornis xar.finna l^yl. Syn. i. (1800) p. 191. — Brit. Exs. : Larb. 

 Caesar, n. 57 ; Cromb. n. 122. 



Though originally regarded by Nylauder as a variety of C. alciconiis, 

 yet " it constitutes a proper species more certainly than many others in 

 this genus " (BuU. Soc. Bot. l. c). It differs from C. ahicorms in the 

 laciniae being constipate, thicker, simpler, and more ascending, firmer 

 when growing, hut rather brittle when dry. The podetia and apothecia, 

 which are very like those of the preceding, are not uncommon. The 

 spermogones also are frequent, and ai'e often sessile on the leaflets. 



Hab. On sandy soil and ou the ground amongst rocks in maritime 

 districts. — Dm^^/-. ' Very local and scarce in the Channel Islands and in 

 S. England. — B. M. : Noirmont, Warren, and Quenvais, Island of Jersey; 

 Jerbourg, Island of Guernsey ; Chateau Point, Island of Sark. Lydd, 

 Kent : Brighton Downs, Sussex ; Start Point, S. Devon. 



Form gracilescens Cromb. — Thallus small ; laciuiae very narrow, 

 much divided, more or less crenate at the apices ; podetia narrow 

 and narrowly scyphiferous. Apothecia not seen. — Cladonia alci- 

 cornis f. gracilesccns Cromb. Grevillea, si. (1883) p. 111. 



A well-marked form, perhaps a variety, of this rather than of the pre- 

 ceding species, characterized by the smaller thallus and the much more 

 slender and divided laciuia?. It closely approaches to \a.Y. gentilis Ach. of 

 C. alcicornis, but diflVrs in the marginal tibrillre being not " long and 

 simple '■ but shortly fasciculate. In the only entire specimen seen the 

 podetia, which are but sparingly present, are sub^terile and only spermo- 

 goniiferous. 



Hah. On the gmuud among rock.-- iu a maritime district. — Distr. ^'ery 

 sparingly iu S. W;des. — B. M. : Lydstep, Pembrokeshire, 



