616 



COMPARATIVE MORPHOLOGY OF FUNGI 



In another direction Hdhnel (1923) attempts in a posthumous work 

 to rearrange the entire system. He divides the Fungi Imperfecti into 

 three groups: the Hyphomycetes, which correspond to Saccardo's group 

 of the same name; the Synnematomycetes, which in the main include the 

 Coremiales of Potebnia; and the Histiomycetes, to which belong collec- 

 tively the forms with plectenchymatous stromata or fructifications 

 (Acervulales, Pseudopycnidiales and Pycnidiales of Potebnia). The 

 gigantic group of Histiomycetes he divides again into a large number of 



<^ 



L 



Fig. 405. — Volutella scopula. 1. Mature sporodochium. 2. Young sporodochium 

 which has not started the production of conidia. 3. Conidia. A group of spores lie 

 imbedded in a gel at the tips of the hyphae. 4. One of the large hyphae of the sporodo- 

 chium and the conidiophores. (1 X 7; 2 X 30; 3, 4 X 780; after Boulanger, 1897.) 



new groups, for name and definition of which one should turn to the 

 original. 



However much these forms may be justified in individual cases, 

 one cannot avoid the impression that the Fungi Imperfecti are better 

 off the less their classification is patched. It is of no great importance 

 from which point of view they are regarded, since one only strives to 

 catalogue them so that one may locate again a definite form with the least 

 expenditure of energy. If one fundamentally changes the structure of 

 this catalogue, confusion results which can be of no profit to the catalogue 



