VERRUCARIA] VERRDCARIACEiE 279 



green and arranged in short closely serried ranks. The perithecia are 

 scattered among the ridges, and arc usually sessile on the sub- 

 stratum. 



Hah. On maritime rocks. — Distr. Kare in the Channel Islands and 

 S. England. — B. M. Coast of Alderney ; St. Aubin's Fort, Greve-au- 

 Lan9on and Plemont, Jersey ; Jerbourg, Guernsey. 



5. V. SCOtina Wedd. in Mem. See. Sci. Nat. Cherb. p. 298 

 (1875) e descript. — -Thallus brownish-black or umber-brown, 

 rather thin, effuse, scabrid or occasionally cracked-areolate, some- 

 times almost entirely evanescent. Perithecia black, prominent, 

 conical or hemispherical, rather large ; perithecial wall entire or 

 subentire ; spores ellipsoid, sometimes almost round, obtuse at 

 the ends, 0,010-17 mm. long, 0,005-9 mm. thick, colourless. 



Exsicc. Larb. Lich. Caesar, n. 98 (as V. margacea). 



Agrees with other maritime species in the very dark-coloured thallus 

 but grows above tide-level and is less distinctly mucilaginous. 

 Weddell noted (Z. c.) an odour of violets due without doubt to some 

 alga with which it is associated. 



Hah. On rocks by the seashore. — Distr. Only recorded from the 

 Channel Islands. — B. M. Noirmont, Plemont and near He Percee, 

 Jersey. 



Aquatic species growing in or near streams, etc. ; thallus suhgelatinouSf 

 continuous or becoming cracked-areolate. 



6. V. aquatilis Mudd Man. p. 285, t. 5, fig. 121 (1861).— 

 Thallus thin, continuous or in spots, mucilaginous, dull olive-black. 

 Perithecia minute, numerous, semi-immersed or often covered by 

 the thallus, slightly depressed at the apex, opening by a pore ; 

 perithecial wall black, dimidiate ; asci small, saccate, 8-spored ; 

 spores small, broadly elliptical or subglobose, colourless, 0,006-8 

 mm. long, 0,005-7 mm. thick. — V. margacea var. aquatilis Cromb. 

 Lich. Brit. p. 112. 



Exsicc. Mudd n. 971. 



Hah. On rocks and stones in the beds of upland streams and 



rivulets. — Distr. Eare in W. and N. England. — B. M. Church 



Stretton, Shropshire; Malvern Hills, Worcestershire; Ayton, Cleve- 

 land, Yorkshire. 



7. V. imbrida Tayl. in Hook. Lond. Journ. Bot. vi. p. 153 

 (1847). — Thallus effuse, thin, tartareous, equal, cracked, brownish- 

 black, olivaceous when moist. Perithecia minute, immersed, 

 scarcely visible, with a wide margined ostiole. Specimen not 

 seen. 



From the description, possibly allied to V. aquatilis or V. hydrela. 

 Considered by Miiller-Argau (Flora Ixxi. p. 550 (1888)) to be referable 

 to the genus Pyrenopsis and quoted by Crombie under P. suhareolata 

 (Part I. p. 24). 



Hah. On smooth rocks near the spray of waterfalls ; Kerry. 



