62 FUNGI. 
cated, and these are no longer regarded so much as species of 
Hendersonia or Diplodia as the pycnidia of Spheria. Other and 
more minute perithecia, containing minute, slender stylospores in 
great numbers, formerly classed with Apospheria, Phoma, &c., but 
are now recognized as spermogonia containing the spermatia of 
Spherie. How these influence each other, when and under 
what circumstances the spermatia are instrumental in impregna- 
tion of the sporidia, is still matter of mystery. It is clear, how- 
ever, that in all these conidia, macrospores, microspores, and 
some spermatia, or by whatever names they may be called, there 
exists a power of germination. Tulasne has indicated in some 
instances five or six forms of fruit as belonging to one fungus, 
of which the highest and most perfect condition is a species of 
Spheria. 
Penisportacet.—Except in the perithecia rupturing irregularly, 
7 and not dehiscing by a pore, some of 
the genera in this group differ little in 
structure from the Spheriacet. On the 
other hand, the Evysiphet present impor- 
tant and very interesting features. They 
occur chiefly on the green parts of grow- 
ing plants. At first there is a more or 
less profuse white mycelium.* This 
Fic. 36.—Uncinula adunca. gives rise to chains of conidia (Oidiwm), 
and afterwards small spheroid projections appear at certain 
points on the mycelium. These enlarge, take an orange colour, 
ultimately passing into brown, and then nearly black. Exter- 
nally these perithecia are usually furnished with long, spreading, 
intertwined, or branching appendages, sometimes beautifully 
branched or hooked at their tips. In the interior of the recep- 
tacles, pear-shaped or ovate asci are formed in clusters, attached 
together at the base, and containing two or more hyaline 
sporidia. Other forms of fruit have also been observed on 
the same mycelium. In an exotic genus, Meliola, the fulera, or 
appendages, as well as the mycelium, are black, otherwise it 
* Tulasne,. ‘‘ Selecta Fungorum Carpologia,” vol. i. Léveillé, “ Organisation, 
&c., sur l'Erysiphé,” in ‘Ann. des Sci. Nat.” (1851), vol. xv. p. 109. 
