226 
MONOGRAni OF THE LABOULBENIACE^ 
majority of instances to surround the individuals wliile their hosts are hiding in moist 
situations. The genera in which the aiitherozoids are exogenous in oi-igin probably 
form an exception to this rule, and the transfer may be effected as above described 
(p. 210). At all eventfj the trichogyne in the genus Zodiomyces always grows down- 
wards (Plate XXIII, fig. 16) as it develops and seems to seek the antherozoid which is 
F 
almost invariably found attached to its tip (figs. 17, 18), and it is only after contact 
with the antherozoid that it turns upward as is shown in the two last-mentioned 
figures. In this instance several specimens have been examined in which there seemed 
to have been a definite conjugation between the two organs, as in fig. 17 ; but as a 
rule this union cannot be satisfactorily demonstrated owing to the very small size of 
the male element. 
The fertilized trichogyne usually disappears before any defi 
it 
o 
pi 
f 
procarpe ; but^soon after 
xpp 
arpogenic cell already described succeed one another 
d corresDond at first 
far as they 
1 the divisions of 
derable rapidity. 
The carDOirenic 
divides by two transverse septa into three superposed cells, the superior and infe- 
supporting cells and the ascogonium ; and the latter, at least in many of the instances 
rved, becomes separated into a lower sterile part which has been above described 
dary inferior supp( 
o 
upper p 
further division, constituting the single ascogenic cell, as in Amorphomyces, Sphalero- 
myces, Peyritschiella (Plate I, figs. 28, 29) and a few other genera ; or becomes divided 
into two such cells, as in Laboulbenia (Plate I, fig. 35, ac) and in many other genera 
Less frequently the number of ascogenic cells may 
ber 
be fo 
of 
Stigmatomyces above described ; while in only 
raplomyces, have eiff/d such cells been definitely observed. Although the number of 
'oogenic cells is moderately constant in a given genus, it does not appear to be inv: 
able, and I have seen rare instances in which two were present in forms having typ 
illy on]y one ; while in a single instance a specimen of Rhadinomyces was' observe 
which three were distinct within the peritheclum in place of the usual four; a coi 
doubtless due to the abortion of one of the original products of the division < 
d 
the ascogonium. 
f 
The form of the ascogenic cell, though generally similar in nmst of the genera, is 
d the posi 
perithecium is sometimes character 
pie, it lies somewhat obliquely in n 
the 
tyof 
n given instances. In Khizomyccs, i:o 
mass 
s 
pe 
appearance represented in Plate TIT ficr. 3 
so that the 
Chitonomyccs 
