1914] Sefchell: Parasitic Florideae, I 7 



as oceurring on the sides of the apical pits in the same way as in 

 species of Laurencia. The apical cell is also similarly situated at the 

 base of an apical pit in each and every one of the Californian species 

 to be described below (pi. 6, fig. 30). 



In JanczeivsMa tasmanica, as figured by Falkenberg (1901, pi. 24, 

 fig. 18) there radiate out from the tubercle free branches, very slender 

 and cylindrical in the tetrasporic plant. The figure in the Pflanzen- 

 familien (1897, p. 431, fig. 243, C) is stated by Falkenberg (1901, 

 p. 257) to be defective in not representing the free branches suffi- 

 ciently slender and cylindrical. Such free branches are practically 

 absent in /. verrucaeformis, but are well represented in some of the 

 California species, at least in the tetrasporic and cystocarpic plants 

 as well as in J. tasmanica. 



All three sorts of reproductive bodies iLsually found among the 

 Florideae are known in Janczewskia, and are represented on different 

 plants which differ slightly in other details of structure from one 

 another. The tetrasporangia are subepidermal, cruciate, or tripartite, 

 and borne either on the outer surface of the tubercle or its free 

 branches, or immersed in conceptacles. The antheridia are in con- 

 ceptacles formed of enlarged apical pits, are transformed leaves, and 

 variously plumose (cf. Solms-Laubach, 1877, p. 212, pi. 3, fig. 15). 

 The procarps are transformed leaves, arising in the apical pits, and 

 developing into cystocarps provided with a pericarp and carpostome 

 (cf. Solms-Laubach, 1877, pi. 3, figs. 5, 7, IJ-M, 17). From a basal 

 placenta within the cystocarp arise branching filaments, each ultimate 

 branch ending in a long pyriform spore (cf. Solms-Laubach, 1877, 

 pi. 3, fig. 17). This closely corresponds with the cystocarpic structure 

 as found in species of Laurencia, as does also the structure of the 

 antheridia and of the tetrasporangia. In all respects, then, except 

 in reduced form and parasitic habit, Janczewskia is very closely re- 

 'lated to Laurencia. 



