230 



THAXTER. — MONOGRAPH OF THE LABOULBENIACE^E. 



and are associated with similar segments having no such function. This function, furthermore, ap- 

 pears to be a transitory one, and as far as has been determined, the discharge of sperm-cells ceases 

 soon after fertilization, and the appendage develops more or less copious sterile branches and loses 

 all traces of its primary function, figs. 7 and 16; a statement which, it may here be mentioned, applies 

 also to the supposed antheridia of Hydrophilomyces. 



The associations of antheridial cells which form the functional portion of the often highly de- 

 veloped compound antheridia are in general very definite, and the numbers of the latter may be, and 

 usually are, more or less invariable in different genera or species. They arise, like the simple an- 

 theridia, as branchlets, which, instead of growing outward, penetrate an adjacent cell, opening and 

 discharging into its cavity, whence the sperm-cells escape by a variably developed, often tubular 

 and elongate outlet, that is sometimes a mere extension of the cell forming the common cavity, 

 or in a few instances involves other cells. An illustration of the last condition is seen in the 

 antheridium of Euhaplomyces, Plate XXXVII, fig. 21, a type not previously illustrated. Another 

 new type is seen in the genus Riclcia, the antheridium of which is quite unlike that of the nearly 

 allied Pcyritschiella; not, as in this genus, adnate to the receptacle, but borne quite free upon it 

 and distinguished by a broad black septum, Plate XXXIV, figs. 12-13. In general form it closely 

 resembles a simple antheridium of the ordinary type, but the several antheridial cells which compose 

 it are nevertheless clearly distinguishable. The singular condition seen in the closely allied Distich- 

 omyces, with its groups of apparently simple and free antheridia, has already been referred to above. 

 The most remarkable, however, among the new types illustrated, are those found in the two new 

 genera, Monoicomyc.es and Eumonoicomyces, Plates XXXVI and XXXVII, the detailed structure of 

 which is described under these genera. This type, which in Eumonoicomyces Papuanus is more 

 complicated than that of any other form, differs widely from those previously illustrated, both in 

 the arrangement of the antheridial cells, and in the method of discharge between four terminal and 

 eventually appendiculate cells. Still another new type is found in the singular Kleidiomyces, but 

 unfortunately the cell relations here are not determinable from the scanty material available. Lastly 

 the many new species of Eucantharomyces illustrate very fully the variations in this highly devel- 

 oped type, in which the usually oblique rows of cells which give it such individuality, appear to 

 represent the intercalary segments of an original branchlet, that become converted directly to anthe- 

 ridial cells which discharge inward. 



Of the fifty-four genera thus far distinguished there are five in which the character of the anthe- 

 ridia is quite unknown, namely, Polyascomyces, Smeringomyces, Misgomyces, Euzodiomyces, and Kai- 

 nomyces, while in the following genera these organs are but doubtfully determined: Chitonomyces, 

 Hydrwomyces, Ceratomyces, Autoicomyces, and Hydrophilomyces. 



Female Sexual Organs. The general account formerly given of the origin and development of 

 the procarp, appears to be substantially correct, and little new information in this connection has 

 been obtained. One type of trichogyne, not formerly observed, is seen in Acompsomyces, the clavate 

 extremities of which are beset in a very characteristic fashion, Plate XLIL figs. 8 and 12, with recep- 

 tive vesicles, which might at first sight be taken for conjugating sperm-cells. 



A most singular departure from the normal method of origin in the procarp is seen in Coreomyces 

 in which not only the female branch, but also the sterile cells of the perithecium, originate endoge- 



