64 PROCEEDINGS OF THE AMERICAN ACADEMY 



the inner ones. As flir, then, as the structure and position of the an- 

 theridia are concerned, Tuomeya is rather more like Lemanea than it 

 is like Batrachospermum. 



The female organs are borne upon especially modified procarpic 

 branches. In the axil of one of the ramelli — generally in the 

 younger, growing portion of a frond, but very frequently also in 

 the maturer, older parts of the same frond — arise one or more short 

 brauchlets of an apj^earance very different from any of the other out- 

 growths from the axis. This branch, for usually there is only one, is 

 made up of broad, stout cells with rather unusually dark cliromato- 

 phores. As the branch increases in length, it as a general rule be- 

 comes spirally twisted (cf. Figs. 12 to 14), and the cells grow out on 

 the convex side into short branchlets (cf. Figs. 13 and 15). This 

 frequently continues until a complex branch is produced. The ter- 

 minal cell of the branch produces the procarp, which in Tuomeya 

 consists of a broadly ovoid trichophore, surmounted by a trichogyne 

 several times longer than itself. The trichogyne is a somewhat 

 elongated lageniform body, about 30 /^ high and 10 /* in diameter at 

 the base, and is connected with the trichophore by a slender, elon- 

 gated pedicel, which is often 10 /x long and 3 /a thick (cf. Figs. 16 

 to 20, tr.). Very frequently the trichogyne is attached to the pedicel 

 obliquely (cf. Fig. 16). The contents of the trichogyne at maturity 

 are clear, and of an extremely light bluish tint. When ready for fer- 

 tilization, the trichogyne is usually very near to the surface of the 

 frond in the older portions, but in the younger parts of looser structure 

 it often remains very close to the axis. 



One, two, or even three antherozoids may often be found attached 

 near the tip of the trichogyne (cf. Figs. 18 and 19). An opening is 

 made by the absorption of the intervening wall, and the contents of at 

 least one of the antherozoids pass into the trichogyne. As a conse- 

 quence of this, the trichophore, whose contents have already become 

 granular in appearance, begins to put forth buds (cf. Figs. 17 to 19). 

 These buds, which are at first few and comparatively large, gradually 

 become divided into smaller and smaller lobes, until at last there is a 

 considerable number of them arranged in more or less concentric rows 

 upon the surface of the trichophore (cf. Fig. 20). As the cystocarp 

 is thus developing, secondary branches grow toward it from the axis, 

 and, surrounding it, obscure its farther development. As far as could 

 be seen, strings of spores similar to those formed in Batrachospermum 

 seemed to be produced. 



In most of the species of Batrachospermum, especially in those 



