DESCRIPTIONS OF PLATES. 
143 
Fig. 27. Section of same, transverse. 
,, 28. Sporidia of Hyst. phormigenum X 400. 
„ 29. Perithecia of Nectria Zealandica, Cke., enlarged. 
,, 30. Section of same. 
„ 31. Sporidia x 400. 
Plate 133- 
Fig. 1. Berggrenia aurantiaca, Cke., natural size. 
„ 2. Section of same. 
„ 3. Cells of exterior X 400. 
,, 4. Section of pileus, with hymenium on the inner 
surface, magnified. 
Figs. 5, 6. Asci and sporidia X 400. 
Fig. 7. Spores of Bactridium magnum X 400. 
„ 8. Xylaria apiculata, Cke., natural size. 
„ 9. Section of capitulum enlarged. 
,, 10. Sporidia x 400. 
„ 11. Xylaria Zealandica, Cke., natural size. 
„ 12. Portion of capitulum enlarged. 
„ 13. Sporidia x 400. 
„ 14. Sporidia of Massaria australis, Cke. X 400. 
REPLY TO DR. M. C. COOKE’S CRITICISM OF PAPER 
ON “ VARIABILITY OF SPH.ERIA QUERCUUM, SZ.” 
By J. B. Ellis. 
In the last number of “ Grevillea,” the editor of that Journal 
makes some statements with regard to my paper on Sphceria 
Quercuum , published in the “ Proceedings of the Academy of 
Natural Sciences of Philadelphia ” last March, which need correc- 
tion. He says, “ It matters not that the sporidia vary in size and 
form, that in some (of the species) they should be obtuse, in 
others rather acute at the extremities, in some hyaline, in others 
deep brown.” Dr. Cooke, who has examined the specimens, must 
have known that these various forms of sporidia instead of being 
characteristic of different species are all to be found in the same 
perithecium, the narrow and acute forms being in fact only young 
or imperfect. As to the sporidia being “ hyaline in some and in 
others deep brown,” the record in “ Grevillea ” contradicts that 
statement, so far at least as the species of C. and E. are concerned, 
Melogramma Aceris alone excepted ; and even in this species my 
specimens have the sporidia hyaline. S. eriostega is also said to 
have the sporidia brown and biseptate ; but it is added that these 
were free spores, the sporidia actually observed in the asci being 
hyaline. In my previous paper I stated, and subsequent observa- 
tions has confirmed the statement, that brown biseptate spores are 
