MORPHOLOGY OF THE GENUS 

 CEPHALOSPORIUM, 



WITH DESCRIPTION OF A NEW SPECIES AND A 



VARIETY 



R. E. Buchanan 

 (With Plates 50 and 51, Containing 9 Figures) 



Certain species of the hyphomycetous genus Cephalosporium 

 have been found to be of common occurrence in the humus-rich, 

 prairie soils of Iowa. The morphology and relationships of this 

 genus have not been well understood; it is therefore believed of 

 interest to publish the results of a study of one of these species 

 and a variety. 



The genus Cephalosporium Corda is characterized by its well- 

 developed hyaline mycelium and its slender, unbranched conidio- 

 phores which abstrict non-septate spores from the tip, these latter 

 being pushed to one side by the later spores and all remaining as 

 a head, stuck together by mucus. The genus Hyalopus Corda is 

 differentiated from Cephalosporium by the abundant production 

 of mucus, and the resultant globular refractive head produced. 

 The distinction is made solely on the relative amount of mucus. 

 Allantospora Wakk has been separated from Hyalopus on account 

 of its allantoid, sometimes 1-2 septate, conidia. One species of 

 Allantospora has been described, A. radicicola Wakk, upon the 

 roots of Saceharum officinarum. Its obvious relationship to 

 Cephalosporium has caused Saccardo (Sylloge 14 : 1043) t° include 

 it among the Amerosporae of the Mucedinaceae, while Clements 

 in his " Genera of Fungi " has placed it under the Phragmosporae 

 (Hyalophragmiae), doubtless because of the occurrence of sep- 

 tate spores. Lindau (Rabenhorst's Krypt. Flora 8: 100-101) has 

 expressed the opinion that the genera Hyalopus and Cephalo- 

 sporium should be united. Under the heading of " Hyalopus 

 populi Nypels " he says : " Bei kulten in feuchten Luft entsteht 



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