Developments of the Oophyte in Trichomones. 287 
segmentation of the antheridium will serve as perfectly trust- 
worthy evidence of affinity to the Mosses ; nevertheless the 
comparison is worthy of note. 
Apogamy . — As above stated, no archegonia have been ob- 
served on cultures of Tr . citatum , nor have any archegonio- 
phores, such as those of Tr. pyxidiferum and other species, 
been seen ; nevertheless sporophytic buds are not of uncommon 
occurrence in connection with the flattened expansions (Fig. 51), 
and the question arose how these are formed. From the partial 
abortion of the antheridia, and entire absence of archegonia, a 
process of apogamous budding might be expected, and 
observation shows that this does take place, though with some 
variety in the details. 
In some cases a filamentous pedicel projects from the margin 
of the flattened expansions (Figs. 52, 53) ; this bears a multi- 
cellular outgrowth upon which, as it enlarges, hairs are formed 
of the conical, thick-walled, sporophytic type above referred to 
(compare Fig. 24). The cellular mass, produced on such a 
pedicel, is at first of indefinite form, but becomes ultimately 
differentiated into parts which may be recognised as the first 
leaf, stem, and root of the young sporophytic plant. In other 
cases the sporophytic bud is not borne on a filamentous 
pedicel, but is inserted with a broad base upon the margin of 
the thallus (Fig. 54). Several of these specimens were care- 
fully examined on both sides, and no archegonia were seen ; 
when it is remembered that no archegonia in any stage of 
development have been noted in this species, and when this is 
associated with the hairy appearance of the buds from the 
very first (sexually-produced embryos being smooth), the 
above statement, together with the drawings, will, I think, 
suffice to establish the point that in the formation of these 
sporophytic buds archegonia do not take a part ; in fact, that 
these buds are a direct vegetative development of the sporo- 
phyte from the oophyte in an apogamous manner. The 
minute details of development have not been followed out, 
partly owing to the want of sufficient material, partly for the 
reason that the growths are not uniform in their mode of 
