438 Rev. M. J. Berkeley on British Fungi. 
at the base, attenuated above. Sporidia forming subglobose 
heads attached by very short peduncles, oblongo-elliptic, tri- 
septate. 
A most elegant species, to which the figure does not do 
justice. It is white in every stage of growth, by which it is 
distinguished, and by the large heads of distinctly septate 
sporidia. 
Tas. XIV. fig. 27. a, Dactylium spherocephalum, nat. size; 6, tuft of 
ditto, magnified ; ¢, a sporidium highly magnified. 
*244. Oidium leucoconium, Desm.! Fr. Syst. Mye. vol. iii. 
p. 432. This species, O. erysiphoides and O. monilioides, are, 
I have no doubt, the early stages of various species of Erysiphe. 
245. Fusisporium udum,n.s. Late effusum, tremellinum ; 
sordidé aurantiacum ; floccis hyphasmatis decumbertibus, 
parcé ramosis; sporidiis longis, curvulis, 3—5 septatis, utrin- 
que acutis. On trees inspring. King’s Cliffe. 
Forming a broad tremelloid mass wet with the overflowing 
sap, composed of slightly branched decumbent filaments, some 
of which are closely septate, others contain a series of globose 
nuclei, while others are quite simple. Sporidia 3—5 septate 
elongated curved, acute at either end, the contents of the ar- 
ticulations orange. In age the septa are absorbed, and there 
is a row of irregular nuclei. 
Tas. XIV. fig. 28. a, flocci and sporidia, magnified; 6, sporidia, highly 
magnified. 
246. F. Bete, Desm.! exs.n.305. Ann. d. Se. Nat. vol. xix. 
tab. 18. On beet root. Apethorpe. 
247. F. Georgine, Kl.! exs. n. 186. On roots of dahlia. 
Apethorpe. 
248. F. album, Desm.! n. 929. On dry but green leaves 
of the oak. Milton, Norths. Moug. and Nest. n. 894. is this 
species, and not the true F. griseum of Greville. 
249. Fusarium lateritium, Nees, Fr. Syst. Myce. vol. iii. p. 
470. On Sophora Japonica. Milton. Mr. Henderson. On 
willow, King’s Cliffe. On lime, Burleigh, Norths. 
*250. Melanconium bicolor, Nees, Fr. Syst. Mye. vol. iii. 
p. 488. Didymosporium elevatum is certainly only a form of 
this species. In Fries’s specimens in Scler. Suec. the sporidia 
are not didymous, neither are they in Dr. Greyille’s plant. 
More modern microscopes show clearly that the supposed 
septum arose from an optical deception caused by the presence 
of the nucleus. The plant again of Carmichael, referred to 
M. spheroideum, Lk., is a form of the same species. 
251. M. spherospermum, Lk., Fr. Syst. Myc. vol. iii. p. 489. 
