« 
MONOGRAPH OF THE LABOULBENIACE.E. 207 
• 
DiMOiiPHOMVCES MUTicus Tliaxtcr. Plate V, figs. 1-10. 
Proc. Am. Acad. Arts and Sci. VoL XXIX, p. 104, 
siib-basal cells often 
Male individual, as in D. denticulatus, slightly larger, the basal ond 
more or less suffused posteriorly with blackish brown. 
Female individual, as in J), denticulatus, more rigid and flattened in habit, the porithecia and 
appendages not bent away from one another. The pcrithecium larger, longer, proportionately 
more slender, its apex truncate or but slightly oblique, the sub-terminal wall-cells i)rodncing no 
tooth-like outgrowth. Spores 23-26 x Sfi. Pcrithccia 75-90 X 15/i. Total Icnglh to tip of 
pcrithecium, 90-130/t. 
On Falagria dissecta Er., Wavcrly, Mass., and Kittery Point, Maine. 
« 
This species occurs sometimes in company with the last on the same host. It is at once 
distinguished by its larger unarmed perithecia, which never show any indication of the promi- 
nence so characteristic of D. denticulatus. Its general habit, though it develops under identical 
conditions, is also quite different from that of tlic preceding species, and no tendency to an an- 
tcro-posterior divergence is observable between the perithecia and appendages. Tlic conforma- 
tion of the tips of the perithecia in either case, as shown in figs. 7 and 1.3, is also very 
different. Four or even more perithecia arc not rarely developed in this species, and in fig. 1 
an instance is shown of an unusually highly developed individual in which the single primary 
pcrithecium that remains is bent to tlic left, its fellow having been broken off or destroyed, while 
five new secondary perithecia are developing on either side ; the youngest, at the extreme right, 
consisting of a mere prominence not yet separated from the proliferating marginal cell described 
in the preceding account of the genus. Tlie same figure shows the remarkable phenomenon of 
an almost complete development of two male spores within the old primary pcrithecium. The 
species is more abundant than the preceding and more readily seen, from the greater size of its 
projecting perithecia. 
DIMER0MYCE3 nov. gen. Plate IV, figs. 12-17. 
h 
Dioecious. Male individual consisting of a scries of superposed cells from which arc pro- 
duced, laterally, sterile appendages and antheridia in a sinde series. The antheridium com- 
pound, consisting of a stalk-ccU followed by four basal cells, above whicli arc six antheridial cells 
arranged symmetrically in the same plane, and discharging the antherozoids into a common cavity, 
whence they make their escape through a terminal orifice, at the tip of a long, slender, tubular, 
terminal prolongation. 
Female individual like the male, the antheridia being replaced by perithecia. The latter 
stalked, the cavity of the stalk-cell, basal cells and pcrithecium proper, eventually continuous, 
through the absorption of all the septa. 
This is in some respects among the most interesting of all the genera of Laboulbcniacca), 
since it combines with a dioecious habit a more complicated development of the male individual 
than is found in any other instance. In Dimorphomyccs, to which it is more closely allied than 
to any other genus, the antheridfum is nearly, if not quite, as highly developed ; but it is always 
