36 PARKIN : FUNGI PARASITIC 



Ceylon Forms. 



A. — Forms resembling Webber's Aschersonia aleyrodis. 



Seven different lots of material collected in Ceylon have 

 been examined, as well as a specimen from Sumatra. These 

 have been compared with some of Webber's own material, 

 kindly sent by him to Mr. Green and passed on to me. 



Without more examples and further investigation it is 

 impossible to claim all these forms as identical with A. 

 aleyrodis. Some seem to resemble A. tahitensis more close] \ . 

 But no sharp line of demarcation between the several forms 

 could be made. 



The conidium (fig. 30) in all is very similar, measuring 

 9-13 x 1*5-2/* ; it may be 3-guttulate. Paraphyses are uni- 

 formly present, but I have not been able to detect in them 

 the peculiar darkened cells (segments) mentioned by Web- 

 ber as being quite characteristic of A. aleyrodis. 



The stromata as a rule have the flattened hemispherical 

 shape. The pycnidial orifices are either arranged in a circle 

 or else dotted irregularly over the surface. 



The colour of the stroma varies from creamy white 

 to bright orange-yellow, and that of the orifices may be brick- 

 red, orange-red, or dull green. A membranous border, term- 

 ed the hypothallus, surrounding the stroma and closely 

 adherent to the leaf surface, may be present or absent. A. 

 aleyrodis possesses one about a millimetre wide, while A. 

 tahilensis does not. 



1. — On a black Aleurodes, sp., on the lower surface of the 

 leaf of Andropogon muricatus (cuscus grass) figs. 28 and 29. 



Stroma creamy-yellow, pycnidial orifices red-brown, fairh 

 numerous and scattered, hypothallus present. 



Some stromata kept for a short time in a closed vessel 

 showed columns of con id i a rising from the pycnidial orifices 

 in a similar manner as described by Webber.* 



This form closely resembles A. aleyrodis. 



2. — On a black Aleurodes, sp., on the lower surface ol 

 the l«':it' of Hedyotis verticillaris. 



* Webber, loo, <■<'.. p. 22. 



