LOBAEIA.] 8TICTEI. 273 



Hob. On the trunks of old trees and on mossy rocks in maritime and 

 mountainous districts. Distr. Seen only in a characteristic state from 

 S.W. En-land. X. Wales, the S. and W. Grampians, Scotland. B. M. : 

 Brver Island, Scilly, Cornwall ; Bettws-y-Coed, Denbighshire. Inverary 

 and Barcaldine, Argyleshire ; Glen Lochay, Perthshire ; by Loch Linnhe, 

 Inverness-shire. 



Form 2. aggregata Cromb. Grevillea, xv. (1877) p. 76. Thallus 

 with ccphalodioid tubercles, either simple or small and aggregate, 

 testaceous or somewhat dark. Sticta pulmonacea var. aggregata 

 Del. Stict. (1825) p. 123, t. 17. f. 62. 



Differs from the state pleurocarpain bearing, not apothecia, but peculiar 

 tubercles, which are rarely present on the under surface of the thallus. 



Hub. On the trunks of old oaks in wooded mountainous districts. 

 Di,*tr. Found only in the S.W. Highlands, Scotland. B. M. : Inverary, 

 Argyleshire. 



47. STICTA Schreb. in Linn. Gen. PL ed. 8, ii. (1791) p. 768 ; 

 Xyl. Syn. i. ( 1 860) p. 351 ; Flora, 1875, pp. 303, 363. Thallus 

 lobate or laciniate. often more or less sorediiferous, beneath with 

 simple rhizinae (rhizohyphrv}, cyphellate or pseudocyphellate ; goni- 

 dial layer consisting of gonidia. Apothecia lecanoroid or parmeleine, 

 with variously septate spores. Spermogones as in the preceding 

 genera. 



Distinguished from Lobaria by the thallus being cyphellate beneath 

 and not scrobiculose above. From the character of the apothecia it may, 

 like Stictina, be divided into two subgenera,viz. Ensticta and Parmosticta, 

 the former with lecanorine and the latter with parmeleine apothecia. 

 Nearly ail the species are exotic, but one seen nowhere else in Europe 

 occurs in Great Britain. 



Subgenus EUSTICTA Cromb. Grevillea, xv. (1887) p. 76. 

 Thallus beneath cyphellate or pseudocyphellate. Apothecia leca- 

 noroid. 



. CypJiellatce. Thallus cyphellate beneath, the cyphellje 

 thelotremoid or urceolate. 



1. S. damaecornis Nyl. form latior Cromb. Grevillea, xv. (1887) 

 p. 76. Thallus expanded, smooth, slightly shining, laciniate, pale 

 brownish-red ; beneath tomentose, dark brown, paler at the circum- 

 ference ; lobes somewhat broadly dilated, sinuate, dichotomous and 

 retuso-truncate at the apices. Apothecia moderate, chiefly marginal, 

 reddish-brown, the margin entire or obsoletely crenulate ; spores 

 fusiform, 1-3-septate, 0,026-36 mm. long, 0,008-11 mm. thick. 

 Sticta damcecornis a. macrophylla Mudd, Man. p. 89 ; Cromb. Lion. 

 Brit. p. 32 ; Leight. Lich. FL p. 119, ed. 3, p. 112. Sticta macro- 

 phylla Hook, in Sm. Eng. Fl. v. p. 205 ; Tayl. in Mack. FL Hib. ii. 

 p. 150 ; Borr. in Eng. Bot. Suppl. t. 2697. The specific name 

 , having been previoiisly given by Delise (1825) to an 



