52 
REPRODUCTION OF TUE ASCOMYCETES. 
to M. Bonorden {loc. cit.). Chcetopsis Wauchii is likewise a sper- 
matiferous form, but it approaches more the typical form than 
those which have just been cited. M. Tulasne considers it as 
analogous to the conidiferous form of Chcetosphoeria innumera^ 
Tub, described formerly under the name of Dermalium virescens^ 
Pers. 
I do not examine in this work the last form and its analogies 
which are often described under the collective name, of Deniatici. 
This ensemble contains some species the membrane of which is 
encrusted and thickened ; it would be necessary to make a parti- 
cular examination of the different genera which enter into this 
case, whether they are known completely {Famago^ Pleospora) or 
incompletely (^Exosporium, Hirudinaria, Speira, Asterosporium, 
Sporocybe, etc.}. We have said something relative to the diffi- 
culties which would arise out of the study of this special point. 
There are also some cases in which in place of three sorts of 
spores one finds in reality four ; we see some examples of it 
among the Nectriacei {Nectria pulicaris, Fr.) . There are some 
rare exceptions, wdiich will merit a special examination ; this is not 
the place to examine them, because we are occupied with more 
general facts. It is necessary to be careful not to confound these 
parasitic forms with their host ; this confusion is impossible when 
one has to deal with two forms of ascophore (^Nectria cinnabarina 
and Sphceria cupularis'), but would be easy between organs of a 
sexual reproduction. 
It is probably to some sperm atiferous forms that belong the 
conidia of small Ascomycetes parasitic upon the leaves of languish- 
ing plants, where they form in pulverulent spots covering the 
dead and partially dried up tissue. The tufts of filaments come 
out by the stomates, just as happens among the Peronopores, and 
each filament is terminated by an elongated and colourless spore ; 
others are borne upon the lateral parts of the filaments. Some- 
times simple, sometimes partitioned, these conidia resemble those of 
Fusisporium-, and probably have an identical morphological value. 
Many of these parasites have been confounded under the name of 
Oidium fusisporoides, Fr., given in general to the conidiiferous 
form ; they have been designated also under different names, some 
of which have been already cited above, apropos of other compari- 
sons. Many species of the genera Hormodendrum, Cylindro- 
sporium, and Graphium ought likewise to enter into the same 
category. They are very frequently encountered in our neighbour- 
hood at times variable according to each different species. It is 
thus the case with the Adoxa and the Figtree, precocious plants, 
the Stigmatea are precocious also ; it shows itself in summer upon 
the Symphytum, during the autumn and winter upon Glechoma 
hederacea. M. Tulasne has given some magnificent figures of the 
Stigmatea Fragarice. The conidia, when the moist atmosphere 
favours their development, may form an adherent series, which 
imitate the curious disposition which is presented in Hypomyces 
