51 



The perithecia (Fig. 14) are red, constricted above the 

 middle. Sometimes the constriction is so strong, that the 

 upper part hangs like a cap over the iinder part; the 

 ostiole is clearly visible, often a little protruding: when 

 ripe the perithecium around it turns black. Paraphyses 

 are présent. The ascuswall is very thin ; when the spores 

 are nearly ripe, it is often much strained and in consé- 

 quence but parti y visible (Fig. 15) and frequently torn. 

 The ascus contains eight spores; thèse are bicellular, of- 

 ten slightly constricted at the septum ; the wall is striate 

 lengthwise (Fig. 16). 



The perithecium is 300—400 n long; under the con- 

 striction it is 210—260 /* wide, over it 160—220 m. The 

 asci measure 100—120 /« X 12 n, the spores 28—32 /< X 

 8 — 10 n. The spores are somewhat .larger than those of 

 Nectria striatospora Zimm. 



The perithecia develop from a yellowish white stroma 

 (Fig. 17). It seems probable that this stroma is the con- 

 tinuation of light brown much branched strandsof mycélium 

 which are frequently met with on dead trees between 

 the bark and the wood and penetrate into the bark (Fig. 18). 

 As I never found them except in pièces of bark which 

 was already dead and inhabited by différent saprophytes, 

 I could not with certainty make out wether Nectria and the 

 myceliumstrands belong together. This will perhaps be 

 possible by cultural study of material in an earlier stage. 



Another fungus which was isolated from advanced canker- 

 spots and grown in pure culture, produced yellow-brown 

 perithecia, probably identical with Nectria coffeicola Zim- 

 mermann; both the perithecia and the two kinds of 

 conidia agrée with those described by Zimmermann O- 

 This form has been rarely found on the bark of dead 



1) See Z i m m e r m a n n, p. 104. 



