HYPHOM YCETES 



J039 



basipetal chains which are more or less persistent, or they may be 

 glued together into masses by agglutinating material. 



The Conidia show two main types — viz., the Aleuriospore and 

 the Conidium Verum . 



An Aleuriospore (Fig. 541) is not a true conidium. It may be 

 terminal, lateral, or intercalary, but in each case it is not 

 originally distinct from the thallus, and is only set free by 

 the death of the filament to which it is attached. It has 

 the morphological significance of a chlamydospore. 



Fig. 542. — SpoROPHORES 

 AND Conidia from a 

 Cladosporium. 



Fig. 543 . — A Phialide 

 FROM Spicaria apho- 



dii VUILLEMIN. 



{a) Phialide. 

 (After Vuillemin.) 



Fig. 544. — A Prophi- 

 alide from Urophial 

 amycophiala Vuil- 

 lemin, 1910. (a) Pro- 



PHIALIDE. 



(After Vuillemin.) 



A Conidium Verum (Fig. 542) is quite distinct from the thallus, 

 from which it is easily detachable. It may or may not be carried 

 on a conidiophore, the varieties of which are as follows : — 



A Sporophore (Fig. 542) is another name for a conidiophore— 

 i.e., for the hypha which carries the conidia. 



A Phialide (Fig. 543) is a flask-shaped segment on the sporo- 

 phore comparable to the sterigmata of the Basidiomycetes 

 and interposed between the sporophore and the conidia. 



A Prophialide (Fig. 544) is a special article on the sporophore 

 from which phialides arise. 



Having thus made clear Vuillemin's differentiation of the spores, 

 it is possible to consider his classification of the Hyphales. 



Classification. — ^ Vuillemin divides the Hyphales as follows — • 



A. Mycelium composed of fine bacilliform hyphse in which the 



nuclei are usually indistinct— Order i, Microsiphonales 

 Vuillemin, 1912. 



B. Mycelium not so composed :^ — • 



1. Reproduction by thallospores — Order 2, Thallosporales 



Vuillemin, 1910. 



2. Reproduction by hemispores — Order 3, Hemisporales 



Vuillemin, 1910. 



3. Reproduction by conidia — Order 4, Conidiosporales 



Vuillemin, 1910. 



