TIIAXTKIi. — MONOGRAPH OF THE L VBoTLm A 1 \< ! : K. 231 
nously, growing, like the autheridial oells of compound anthcridia, into the cavity of tli« iiiYyu nl cell 
above. Not only is this cell traversed by the piocarpic, and later by the peri the < ial branches, bul 
several cells above are successively penetrated, the intervening septa being |>erforate<l and destroyed 
the free trichogyne eventually making its way out distally and rep] ing the terminal prima? \ ap- 
pendage, which is sloughed off. This very peculiar condition, which is illustrated on Plate* LWI, 
and described in detail under the genus, lias no counterpart in the group. The peritheeia of Zodi- 
omyces } although the branches which produce them arise endogenously, are themselves c\< :enou 
and quite free from the beginning of their development In CenU Iyer although the forma- 
tion of the perithecium is not of the ordinary type, the conditions do not appear to be in am 
comparable. 
The early development of the Carpogonium after fertilization has been described in detail in th- 
Monograph, and appears to be similar throughout the group. The only striking phenomenon in 
this connection that has been observed among the new forms is seen in the genus Poly a "/////ne*, 
in which the ascogenic cells become so greatly multiplied thai I condition occur no( unlike thai n 
in the perithecium of other Ascomycetes, more than thirty ascogenic cells covering a basal area from 
which large numbers of asci bud upwards; Plate XXXVII, figs. 1 2. 
The cytology of ascvis- and spore-formation has been examined by Dr. Paull who li- published 
a preliminary note in Science, already referred to, and has kindly allowed the writer to examine his 
preparations. The latter appear to show that the phenomena involved correspond < « ntially with 
those in other Ascomycetes, the ascospores being formed as a result of the divisions of a fusion-nudeus 
by a process exactly similar to that which is normal in this type of spore-formation. Sim Dr. Faull 
has not as yet published a full account of his r- ults. the writer <]<>< noi fed at liberty to make 
further reference to them in the present connection. 
genera, fundamentally toe m»e, except in 
llie structure ol ttie mature perunccuun is, in an g 
the case of the pseudoperithecium of Coreomijns, and has been given in detail in the Monograph. 
The most important variations relate to the number of cells in each of the four outer and of the 
four inner and alternating rows of wall-cells, and to the production of outgrowths or appendages from 
the outer rows. A curious condition has, however, been observed in Dichomyxs, some species of 
which show a remarkable dimorphism in their peritheeia; the two forms being associated on the 
same individual a. in D. hyhridus, Plate XXXI, fig. 16; or occurring, as in I), hi) mis, Plate XXXlfl. 
figs. 2-3, on distinct individuals. In both these instances it will he observed that the two varieties 
are not only unlike in size ami form, and to some extent in color; but that, while in one auricle- 
f 
like outgrowths are present, these are wholly absent in the other. Two forms of perithecium al 
20 
species 
It is possible that the dimorphism in D. hybrulux, may 
have resulted from hybridization, for 
furcift 
on 
ever, appears to occur in other spec 
in this way. Among instances in which tin- perithecium may show wide differences in form in a 
given species, Uhouihenia Polyhirmw may be mentioned. Plat.- LXV, figs. 1 3; ami the varieties of 
L. Texana, if these arc rightly separated merely as varieties, show very remarkable conditions in 
this respect, Plate LXIII, figs. 3-9. 
