UPON SCALE-INSECTS. 29 



A larger form of this fungus has also been collected in 

 Java and is described as a separate variety by this author. 



Fungi referable to this genus have not yet been discovered 

 on scale-insects in Ceylon. 



Genus Hypocrella, Sacc. 



This genus is one which may eventually be shown to be 

 of common occurrence on scale-insects. It is characterized 

 by having disc-shaped or hemispherical stromata in which 

 the perithecia are sunk. Its thread-like ascospores often 

 break up into sporules. 



The species so far described have been found on leaf and 

 stem surfaces in the tropics. Quite possibly in some of 

 these cases a scale-insect is the real host and not the 

 plant. 



The conidial fructification, as far as is known, belongs to 

 the genus Aschersonia — one which occurs frequently on 

 scale-insects. 



Zimmermann in his paper* describes for the first time a 

 new species of Hypocrella (H. Raciborskii), having as its 

 host a scale-insect. It was found by Raciborski in Central 

 Java on a coccid fixed to a Citrus leaf. It possesses a 

 conidial fructification of the Aschersonia type. The conidial 

 chambers (pycnidia) are situated in the lower part of the 

 stroma whereas the perithecia are formed in the upper 

 part. 



A Hypocrella distinct from the above has been collected 

 in Ceylon, showing no conidial fructification. 



Though numerous examples of Aschersonia have been 

 found in Ceylon, only in one have the stromata possessed 

 perithecia as well as pycnidia. 



A third example of a probable Hypocrella had a stroma 

 not strictly referable to Aschersonia. 

 Ceylon Forms. 



1.— On Lecanium expansum on the upper surface of leaves 

 of Schumacheria alnifolia, Maskeliya, Sept., 1901 (fig. 23). 



* Zimmermann, loo. cit. 



