POLYMORPHISM. 



195 



one proper to the pink, or Tubercularia form, with, naked slender 

 conidia, the other proper to the mature fungus, enclosed in asci, 

 and generated within the walls of a perithecium. Instances of 

 this kind are now known to be far from uncommon, although 



Fro. 106.— D. Nectria surrounding Tubercularia; E. tuft of Nectria cinnabarina; 

 F. section of stroma ; G. ascus aud paraphyses. 



they cannot always, or often, be so clearly and distinctly traced 

 as in the illustration which we have selected. 



It is not uncommon for the conidia of the Sphceria to partake 

 of the characteristics of a mould, and then the perithecia are 

 developed amongst the conidial threads. A recently recorded 

 instance of this relates to Sphceria Epochnii, B. and Br.,* the 

 conidia form of which was long known before the Sphceria 

 related to it was discovered, under the name of Epochnium, 



fungorum. The Epochnium forms a thin stratum, which over- 

 runs various species of Corticium. The conidia are at first uni- 

 septate. The perithecia of the Sphceria are at first pale bottle- 

 green, crowded in the centre of the Epochnium, then black green 



. granulated, sometimes depressed at the summit, with a minute 

 pore. The sporidia are strongly constricted in the centre, at 

 first uniseptate, with two nuclei in each division. 



Another Sphceria in which the association is undoubted is the 



• Berkeley and Broome, in "Annals of Natural History" (1866), No. 1177, 

 pi. v. fig. 36; Cooke, " Handbook," ii. p. 866. 



