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 



FIG. 106. D. Necti-ia surrounding Tubercularia; E. tuft of Nectria, cinnabarina ; 

 F. section of stroma; G. ascus and 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 Spkaria 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 Sphteria Epochnii, B. and Br.,* the 

 conidia form of which was long known before the SpluBria 

 related to it was discovered, under the name of EpocJinium^ 

 fang or um. The Epochnium forms a thin stratum, which over- 

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

 septate. The perithecia of the Splusria 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 Sphcsria in which the association is undoubted is the 



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

 pt. v. fig. 36 j Cooke, " Handbook," ii. p. 866. 



