ENDOCARPON. 



293 



a series of depressed, brownish points, which are the con- 

 tracted mouths of urceolate, immersed apothecia. The thecse 

 and paraphyses are chiefly developed from the base of the 

 cavity. The latter are of capillary tenuity, straight, almost 

 simple, and embedded in an abundant mucilage ; the most 

 central ones are united at the summit, which reaches that of 

 the apothecia, and has a reddish-brown colour. Hence the 

 occlusion of the apothecium is less perfect than in a typical 

 species of the genus Undocarpon, — as U. miniatum, in which 

 the paraphyses are developed perpendicularly to the walls 

 and convergently to the centre of the cavity, and are colour- 

 less throughout. Its spermogones are denoted by blackish 

 points similar to, but smaller than, those which mark the 

 orifice of the apothecia. Their cavity is sinuous ; their ste- 

 rigmata linear and irregular ; their spermatia straight. 



Thallus squamulose or tartar eous ; spores very large, 

 3. Endocarpon sorediatum. Thallus a single squamule, 

 closely adnate by delicate rhizinse ; margins greyish -pulveru- 

 lent. Thecse two-spored. Spores linear-oblong, obtusely 

 rounded at ends, uniseptate, green, cellular or muriform. 

 (E. B. 2612.) The only habitat mentioned by Leighton is 

 Eottingdean Cliffs, Sussex ; and by Hooker, mud walls at 

 Thetford, Norfolk. 



