40 Dr. Deakin on new species of Verrucaria and Sagedia. 



gray, sometimes quite pink, becoming of a brownish hue when 

 moistened j beneath the outer coat is a green layer of minute gra- 

 nules upon a hard white substratum. Apothecia scattered, entirely 

 sunk in the thallus, of a globose shape, contracted at the top 

 into a narrow neck ; the apex small, naked, but not elevated above 

 the thallus, obtuse, with a small, more or less umbilicated pore. 

 Peritheciwn entire, thickish, tough, black. Nucleus black, 

 becoming blackish-brown when moistened, and with black gra- 

 nules mixed amongst it. Sporidia in asci eight, large, oblong 

 obtuse, two-celled, slightly contracted at the septa, granulated, 

 of a pale brownish-yellow colour. 



Hab. Limestone rocks, Torquay, Devonshire. 



S. marina. (Plate IV. fig. 13.) 



Thallus crustaceous, subgelatinous when moist, smooth, con- 

 tinuous, dark greenish-black, terminated by a narrow black 

 margin; apothecia very small, numerous, scattered, immersed, 

 the apex slightly elevated ; pore minutely papillated ; perithe- 

 cium entire, black, submembranaceous ; nucleus black, yellowish 

 and hyaline when moist ; sporidia minute, ovate-oblong, single- 

 celled, colourless. 



Thallus spreading in large, continuous, smooth, even, irregular- 

 shaped patches of a dark greenish -black, becoming of an olive 

 hue when moistened ; the surface is somewhat polished, occa- 

 sionally slightly pitted, at other times with minute elevated points; 

 generally it is perfectly continuous, but in those specimens 

 grown upon rocks less frequently covered by the sea it is cracked ; 

 the internal substance when dry is similar in appearance to the 

 outer, but when moistened it is a yellowish-green, darker towards 

 the surface, semitransparent, and of a subgelatinous texture. Apo- 

 thecia very minute, not visible to the naked eye, immersed in the 

 thallus, of an obovate or oblong shape ; the apex slightly elevated 

 above the surface of the thallus, depressed in the middle, having 

 a central minutely papillated pore. Perithecium entire, thin, 

 submembranaceous, black; when dry almost colourless, when 

 moist more or less contracted towards the top into a neck. 

 Nucleus when dry almost black, pale yellowish-brown and hyaline 

 when moist. Sporidia minute, ovate-oblong, single-celled, 

 colourless, containing one, two, or three granules. 



Hab. Rocks submerged by the sea at high- water, Meadfoot, 

 &c., near Torquay, Devonshire. 



EXPLANATION OF PLATES L IL IIL and IV. 



Fig. 1 . Verrucaria neglecta, Deak. : — a, in a dry state ; 6, in a moist state ; 

 c, slightly magnified ; d, vertical section of thallus and apothecia 

 magnified ; e, aj)0thecium with its papillated apex ; /, the same 

 with the apex fallen away ; g, vertical section of the same ; 

 h, sporidia greatly magnified. 



