POLYMORPHISM. 195 
one proper to the pink, or Zubercularia 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 
Fic. 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 Spheria 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 Spheria Epochnii, B. and Br.,* the 
conidia form of which was long known before the Spheria 
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 Spheria 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 Spheria in which the association is undoubted is the 
* Berkeley and Broome, in ‘‘ Annals of Natural History” (1866), No. 1177, 
pl. v. fig. 36; Cooke, ‘‘ Handbook,” ii. p. 866. 
