78 



GUIDE TO THE MODELS OF FUNGI. 



GENUS LIJ.—PORONIA Willd. 



Stipitate; stroma between fleshy and corky, fructifying surface 



discoid ; perithecia immersed. The fol- 

 m lowing species is the only one known in 

 ^' Britain. 



205. Poronia punctata Fr. — Stipi- 

 tate, turbinate, externally blackish ; disc 

 truncate, whitish, dotted with the black 

 ostioles. 



Gregarious on horse and cow dung. 





X-200 



Fig. 88. — Poronia punctata Fr. 

 (Natural size.) Section showing 

 perithecia x 2. Ascus x 200. 



GENUS LIII.—HYPOXYLON Bull. 



Convex or plane ; stroma corky 

 or brittle ; perithecia immersed. There 

 are thirteen species in Britain. 



XSmrtt 



206. Hypoxylon cocci- 

 neum Bull. — Globose, about 

 the size of a pea, often 

 becoming confluent, at first 

 pruinose, becoming brown- 

 ish vermilion, black within; 

 perithecia ovate with pro- 

 minent ostiola. 



<209 



Common on beech, and Fig. Sg.-Hypoxylonconcentricum Grey, and section 

 ' showing the perithecia. (Natural size.) Ascus x 



gregarious 



SUB-CLASS III.— TUBERACE.^. 



Subterranean fungi ; hymenium enclosed by an indehiscent 

 peridium, waved and sinuate, often intricate and closely packed. 

 There are thirteen genera and twenty-five species of British Tuber- 

 acece ; two are illustrated by models. 



GENUS LIV.— TUBER Mich. 



Peridium warty or tuberculated, rarely smooth, without any 

 definite base ; spores elliptical, reticulate, or echinulate. 



