228 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



The fungus produces chains of elongated colourless conidia, on 

 simple upright branches, springing from the superficial mycelium, 

 (fig. 80, a) . The conidia become detached from one another very easily. 



The spores are fairly uniform in size, averaging 55-60 fj. long 

 and 15-17 ft wide.* Spores up to 65 fx and down to 45 long have been 

 observed, the width ranging from 13/* to 18 p, The longer spores 

 are not proportionately thick. The conidia germinate readily in 



Fig. 80. — a. Conidia; b, Conidia germinating (X550). 



moist air by the production of a germ tube from a point near one 

 pole (fig. 80, b). ♦ 



All the members of this group of fungi produce a second, more 

 complex fructification in the shape of asci, in a perithecium. The 

 perithecium belonging to this fungus has not yet been observed, 

 and as the various genera are identified by means of the perithecium, 



* P = tuoo mm. 



