CRYPTOGAMIA FUNGI. 139 



aid sometimes lobed; colour orange-yellow. PERS. Syn. 120. S. 

 subterraneum, GREV. FL Edin. 461. Crypt. FL t. 101. 



Hob. Attached to the roots of mosses in deans. On Hyp- 

 num striatum, in Longridge Dean. 



6. S. pteridiSj " black, very minute, roundish or oval, numerous, 

 depressed." GREV. FL Edin. 463. MOUG. and NEST. No. 673. 



Hob. On the dead stems of ferns. On Aspidium Filix-mas., 

 in shaded and moist situations. 



72. XYLOMA. 



1. X. rubrum, spots rather large, generally circular, even with 

 the surface or raised, reddish-orange, dotted with black. PERS. 

 Syn. 105. HOOK. Scot. ii. 9. Poly stigma rubrum, GREV. FL Edin. 

 365. Crypt. FL t. 120. 



Hob. On the leaves of the sloe in autumn. 



The claims of this to be numbered amongst vegetables are 

 slight, but not slighter than those of any other species in 

 the genus. The acidity of the sap acting on the green 

 parenchyma into which it has been effused, will account 

 for the red colour ; the dots or punctures on the surface 

 are probably enlarged pores of the epidermis ; and the un- 

 equal and irregular grains called sporules, are, by their 

 very inequality, proved to be any thing rather than the 

 seminal products of a proper vegetation. 



2. X. salignum, spots small, roundish, black, almost even with 

 the surface, many on a leaf PERS. Syn. 106. GREV. FL Edin. 

 368. MOUG. and NEST., No. 268. Phoma salignum, Hot. Gall. 

 ii. 726. 



Hob. On decayed leaves of Salix caprea and aurita, fre- 

 quent. 



The spots are about one-half line in diameter, and have a 

 tendency to follow the nerves of the leaf in their arrange- 

 ment. 



3. X. concavum, spots numerous, small, circular or oblong, con. 

 cave, bordered, black GREV. FL Edin. 368. Spharia concava. 



