248 PETCH : 



rounded, 12-15 x 2 ^. Aschersonia stage — Asckersonia 

 Andropogonis P. Henn., Hedwigia (1900), p. 139 : Ascher- 

 sonia parasitica P. Henn., Hedwigia (1904), p. 149. 



In tlie first examination of Hennings' types of this species I 

 referred them to Aschersonia Aleyrodis, from which they appeared 

 to differ only in their slightly longer paraphyses. A more 

 extensive collection made by Professor Thaxter in Trinidad has 

 shown that it is distinct, and has furnished the Hypocrella stage. 



Aschersonia Aiidropogonis P. Henn., ty|3e in Herb. Berlin, on 

 Andropogon, Mattogrosso, Brazil, is on an Aleyrodes ; the indivi- 

 dual specimens are not up to 20 mm. long, as stated by Hennings, 

 this measurement being due to the fvision of several stromata; 

 there are two pieces of grass in the type, one of which bears 

 specimens, somewhat resembling distorted developments of A. 

 Aleyrodis ; the ostiola are arranged more or less circularly round 

 the base ; the other piece bears effete specimens, witli scattered 

 ostiola. Aschersonia parasitica P. Henn., type in Herb. Berlin, 

 on Andropogon, K. Fiebrig. Plantae Paraguayenses, No. 779, is 

 on a black Aleyrodes ; the specimens are very' poorly developed 

 and scarcely sufficient for an exact determination, but they appear 

 to be this species. 



The Trinidad collection contains a large number of specimens 

 on a grass. The majority are Aschersonia ; these are white or 

 cream, with irregular, scattered pycnidial orifices. Two specimens 

 are somewhat ocliraceous, and bear perithecia in the thickened 

 parts of the stroma between the pycnidia. Though this species 

 belongs to the same group as A. Aleyrodis, its pycnidia are, in 

 general, more widely separated, and the masses of pycnospores 

 do not, in the available specimens, fuse together. Potash 

 colours a section yellow and gives a yellow extract. 



Glaziou 18,812, included under H. ochracea in Herb. Kew, is 

 immature Aschersonia, but probably this species; the stromata 

 attain a diameter of 6 mm. A specimen in Herb. Kew from 

 Brazil, included under A. placenta, is also probably referable to 

 this species; it bears considerable resemblance to Glaziou 18,812, 

 but is Hypocrella, its perithecia being filled with interlacing 

 hyphae; the stroma is white, almost plane, dotted with pale 

 yellow ostiola. 



Distribution. — Trinidad, in Herb. TJiaxter. Brazil, in Herb. 

 BerUniA. Andropogonis). Paraguay, inHerb. Berhn{A. parasitica). 



Figures. — Plate 2, tig. 20, Hypocrella, Trinidad, ex Herb. 

 Thaxter: x 5; Plato 3, fig 53, Aschersonia, Trinidad, ea? Herb. 

 Thaxter, x 6. 



Hypocrella Sloaneae Pat., in Duss, Enum. Champ. 

 Guadeloupe, p. 80 (1903). — Pycnidial stromata circular, 1-2 

 mm. diameter, discoid, consisting of a central conidiiferous disc, 



