

156 TABULAR ARRANGEMENT 



Order XXVIII.— SPH^EEIACEI. 



Perithecia opening by a distinct ostioium or orifice. 



Genera. 

 Section I. — Xylarici. 



302. Stipitate. Stroma corky, rarely fleshy. Perithecia 



immersed. Sporidia uniseriate, simple, ovate, 

 dark-coloured. Xyi.aria, Fr. 



303. Stem shrubby or simple. Perithecia of the same 



substance as the stem. 



TlIAMNOMYCES, Ehr. 



304. Stipitate. Stroma between fleshy and corky. 



Fructifying surface discoid. Perithecia im- 

 mersed. Sporidia ovate, simple, coloured. 



Poronia, Fr. 



305. Convex or plane. Stroma corky or brittle. 



Perithecia immersed. Sporidia ovate or lan- 

 ceolate, curved unsymmetrical, simple, dark- 

 coloured. Hypoxylon, Bull. 



300. Stroma expanded, pulverulent, becoming indu- 

 rated and carbonized. Perithecia immersed. 

 Sporidia uniseriate, lanceolate, curved, simple, 

 d'ark-coloured. Ustulina, Tul. 



307 Stroma discoid. Perithecia immersed, in sepa- 

 rate cells. Sporidia ovate or ovato-globose, 

 straight, simple, dark-coloured, excluded in 

 tendrils. NUMMULABTA, Tul. 



