400 TEXT-BOOK OF FUNGI 



patches, never cohere together in fascicles to form a stem- 

 like structure. Both hyphae and conidia are either colour- 

 less, or clearly and brightly coloured, never dingy brown, 

 olive, or blackish. 



The conidia may be either simple (unicellular) or 

 variously cut up by septa into a varying number of cells. 



Some genera as Ramularia, Ovularia, etc., are parasitic. 

 Species of Botrytis, Oidium, etc., are now known to be 

 conidial forms of ascigerous fungi. Aspergillus glaucus is 

 the conidial form of Eurotium herbariorum. 



FIG. 132. Cladosporium epiphyllum. i, portion of a branch of Prunus 

 japonica bearing two masses of gum caused to accumulate by the fungus ; 

 2, Cladosporium form of fruit ; 3, section of a portion of the periphery of 

 a black gum-mass, showing the hyphae of the Cladosporium ; 4, dark- 

 coloured tips of hyphae from the periphery of the gum-mass, bearing 

 large, thick-walled, brown cells ; 5, large thick-walled cells germinating in 

 a nutrient solution in the absence of air, and producing yeast-like cells, 

 which reproduce themselves by budding ; 6, stray cells emitting germ-tubes, 

 seen in the material described under 5 ; 7, micro-sclerotia germinating 

 under conditions similar to those described under 5, and producing similar 

 conidia ; 8, large, brown, thick-walled cells germinating in a nutrient solu- 

 tion with free access of air, and producing the form of fruit known as 

 Dematium pullulans ; 9, conidium of the Dematium increasing by bud- 

 ding ; 10, fragments of sporophores of Cladosporium producing a slender 

 form of Dematium pullulans ; n, a form of Macrosporium often appearing 

 on old canker spots caused by the Cladosporium : no genetic connection 

 between the two could be established ; 12, conidium of the Macrosporium 

 germinating. Fig. i, half nat. size ; the remainder highly mag. (From 

 Kew Bulletin.} 



The full account of the research illustrated by this plate, and entitled 

 ' Gummosis of Prunus Japonica,' is contained in the Kew Bulletin, 1899, 

 p. i. 



Dematieae 



Hyphae often forming a cottony or byssoid expansion 

 of a dusky colour, rather rigid, not aggregated into definite 

 fascicles or wart-like bodies. Both hyphae and conidia are 



