204 



IXTRODUCTION TO THE STUDY OF FUNGI 



that some of tlie species of Ncdria have an early stage in 

 which the stroma develops only conidia without perithecia, and 

 that these conidial forms were in earlier times regarded as 

 autonomous moulds of the genus Tiibcrcidaria} Later on 

 perithecia appear upon the old stroma, which contain asci and 

 sporidia (Fig. 94). 



There are a few species which resemble, when mature, in 

 external appearance certain species of Ncdria or Dialoncdria, 



hut are accompanied 

 by capitate conidial 

 forms which are not to 

 be distinguished from 

 species of the Hypho- 

 raycetal genus Siilhum. 

 Such species of the 

 Ncdrieae are associated 

 under the genus 

 Sjjhaerostilhc. Other 

 species, formerly united 

 with Nedria, have the 

 perithecia seated upon 

 a more or less byssoid 

 subiculum ; these are 

 now separated from that genus, and united under the name 

 of Byssonedria, analogous to the Byssosphacria of the 

 Spliaeriaceae. In another group, the perithecia, which resemble 

 Nedria, are densely gregarious, and often partially immersed 

 in a velvety subiculum, transformed from the tissues of 

 decaying Fungi. This genus is Hypomyccs, each species of 

 which has also a conidial form, which precedes the 

 ascigerous, and corresponds to some genus of the Mucedineae. 

 Some of the species of Ncdria and Dicdoncdria also 

 have conidial forms, which would be referable to the 

 Hyphomycetal genus iusarium. In these instances we must 

 recognise the relationship between the Hypliomycdcae and 

 the Ascomyceteae, but it would be assuming too much to infer, 

 from a few examples, that all the species of Stilbum are conidia 

 of Sphacrostilhe, or Tidjercularia of Nedria, Isaria of Cordyceps, 

 ^ See Gardener's Chronicle, 28th Jan. 1S71. 



Fig. 94. — D, Tuberctdaria with Xectria ; E, Nedria, 

 F, section of stroma ; G, asci and sporidia 

 Gard. Chron. 



