;}4 PARKIN : WWSV PARASITIC 



^B) FDNGI-IMPERFEGTI. 

 S) Jiceropsidales-Nectrioidacece. 



Genus Aschersonia, Mont. 

 This genus* was founded in 1848 by Montague for certain 

 conidial Btages of fungi collected in the tropics on the 

 surface of leaves. It is characterized by possessing brightly 

 coloured hemispherical, turbinate, or pulvinate stromata, the 

 surface of which is sprinkled over with darker coloured 

 dote, the openings to the sunken conidial receptacles 

 (pycnidia). The conidia are very small, fusiform, and 

 hyaline, and are borne singly on short filiform hyphae, which 

 line the pycnidium and which have interspersed amongst 

 them, as a rule, longer sterile ones, paraphyses. 



In 1893. in Florida, Webber found on orange leaves badly 

 infested with a scale-insect known as the mealy wing or white 

 tly {Aleurodes citri), highly coloured pustules of a fungus. 

 The insects and the pustules were mingled together <m the 

 surface of the leaves. Finding the fungus similarly asso- 

 ciated on several subsequent occasions, he was led to. regard 

 it as most likely parasitic on the insect. A preliminary 

 account of the fungus was published in 18°4,t when it was 

 provisionally referred to Aschersonia tahitensis. Mom. 

 Since then the fungus has been examined by Patouillard and 

 compared with the original specimens of A. tahitensis, with 

 the resull of making this fungus of the orange groves of 

 Florida a .list inn species, .A. afeymfes, Webber. It appears to 

 differ, however, only slightly from A. tahitensis. A full 

 account of th<' fungus is given in Webber's paper "On 

 the Sootj Mold of the Orange and its Treatment. "J In this 

 treatise are mentioned four other kinds of Aschersonia 

 parasitic on Bcale-insects, but a full description of them 

 le i. 91 • ?ed for a future occasion. 



ii. vini "Die Grattung Lsoheraonia, Mont." Festschrift tiix P. 

 \ nohei -"" 191 i p I 

 + Webber J urn. ol Myool., VII., p. B68 

 J Webb r, U.&. L \>>\^r \ 1897, No 18. 



