284 INTRODUCTION TO THE STUDY OF FUNGI 



Demuticae, for TrickosjJorinm fuscum is found forming the 

 subiculum of Bosellinia aquila, and the common Bispora 

 monilioides is reputed to constitute the conidia of a small 

 Peziza, hence called Bisporella monilifera ; but this appears to 

 us a doubtful case. FusiclacUum clepressum is reported to be 

 the conidia of Phyllacliora angelicas, and Pohjthrincium 

 trifolii of Phyllachora trifolii. Species of Cladosporium, 

 of Cladotrichum, and Hehnintliosporium respectively are be- 

 lieved to be related genetically to various species of the 

 Sphaeriacei, and especially species of Macrospoj'ium to certain 

 species of Phospora. It is sufficient for our purpose to suggest 

 these relationships as indicating the evidence on which the 

 Hyphomycetes are concluded to be imperfect Fungi, and 

 principally conidial forms of Ascomycetes. 



After this digression we may return to the two inferior 

 families of the order, in which 

 the hyphae are fused into a com- 

 , mon stem. The Stilheae (Fig. 

 ■^ 131) are of a more imposing 

 .^ appearance than the Tubercu- 

 larieae, and perhaps of a higher 

 ^J' \\Y / ' , /,,' development. There are not 



more than about five hundred 



Fig. 131. — bliibum vulyare. . 



described species, and these are 

 grouped in two parallel sections : the Hyahstilheae, in which the 

 hyphae and conidia are pallid ; and the Phaeo stilheae, in which 

 the hyphae and conidia are typically dusky coloured. Thus 

 these two sections correspond to the Mucedineae and the 

 Dematieae. 



The Hyalostilheae, as far as at present known, are less 

 variable in fructification than the Phaeostilbeae, it being found 

 necessary to recognise but two of the subsections : the 

 Amerosporae, in which the conidia are globose or oblong, 

 and continuous ; and the Phragrnosporae, in which the conidia 

 are septate. The latter is a very small section, of some seven 

 or eight species, so that practically the Hyalostilheae have small 

 and continuous spores, or conidia. The subsidiary arrangement 

 is very much on the same lines as in the moulds. The 

 principal genera are the old ones of Stilhum and Isaria, with 



