244 FETCH : 



perithecium. Specimens have been received, ex Herb. Sydow, 

 on Premna odorata, Manila (cell. P. W. Graff.). 



In Herb. Peradeniya there is a specimen of unknown origin, 

 but most probably from Ceylon ; it was not seen by Parkin, and 

 was probably collected between 1900 and 1904; its processes 

 are cylindric, with a rounded apex, up to ■ 6 mm. high and 

 0*3 mm. diameter, each containing a single perithecium; its 

 asci, in some examples, show the full development of the part- 

 spores, from cylindric spores, 8-12 x 2 ^, to oval spores, 

 8-10 X 3-5 (J,, both spores being found in the same ascus. 



Another gathering of the Hypocrclla is contained in Herb. 

 Kew, labelled " on Smilax barbata, Singapore." It is apparently 

 immature. 



At the time the preliminary note on the Genera Hypocrella 

 and Aschersonia w^as published the relationship of Aschersonia 

 placenta to Hypocrella Raciborskii was not suspected. Recently, 

 however, a large collection of Anchersonia placenta on an Aleyrodes 

 on Schleichera trijuga was made at Peradeniya, which yielded 

 both stages, and a re-examination of the herbarium specimens 

 has left no doubt on that point. The collection was in many 

 respects a remarkable one, as it contained the typical fiat Ascher- 

 sonia placenta, the pulvinate Aschersonia, which has been named 

 Aschersonia javanica, and all possible forms of the ascigerous 

 stage. It was also notable for the large number of stromata 

 present on each leaf, in some instances so densely congregated 

 that they had fused into continuous sheets several centimetres 

 long. At the same time, an Aleyrodes on a Murraya exotica near 

 by was attacked by the same fungus, and in this case the majority 

 of the stromata were the minute convex-pulvinate form, with a 

 few pycnidia, wliich has been named Aschersonia novogxdneensis. 



The typical form of Aschersonia placenta is readily recognized 

 by its radially-elongated pycnidial orifices arranged regularly 

 round the stroma ; at first these ajjpear as red spots on the 

 yellow stroma, but subsequently the masses of spores from 

 adjacent pycnidia fuse and form a red-brown layer over the 

 central portion, leaving only a narrow border free. In addition 

 to this form, however, hemispherical or pulvinate stromata occur, 

 in which the pycnidia are scattered ; their ostiola consequently 

 exhibit no definite arrangement, and the spore masses remain 

 separate. Stromata frequently occur, in which the centre is 

 undeveloped, there being merely an annulus, bearing pycnidia, 

 round the scale insect. Flattened and hemispherical examples 

 may occiu" together, but the former are the more common ; there 

 is no other difference between them, except that in some cases the 

 pulvinate forms retain the yellow colour on keeping, w^hile the 

 stromata of the flattened form usually fade to white ; this 

 however, is not universal, as the pulvinate forms in the types of 

 A. novoguineensis, A. javanica, and A. lecanioides have all faded. 



Aschersonia placenta is very near A. Aleyrodis Webber, but 

 the latter has a slightly different stroma, and longer parapliyses . 



