8 University of California Publications in Botany [Vol. 6 



VI. TAXONOMY 

 Janczewskia verrucaeformis Solms 



Solms-Laubach, Mem. de la Soc. Nation, d. Sci. de Cherbourg, vol. 21, pp. 

 209-224, pi. 3, 1877. 



Ardissone, Mem. Soc. Critt. ital., vol. 1, p. 351, 1883. 



Hauck, Die Meeres Algen, p. 524, 1885. 



Bornet, Mem. de la Soc. Nation, d. Sci. de Cherbourg, vol. 28, p. 301, 1892. 



Schmitz und Falkenberg, in Engler und Prantl, Die Natiirl. Pfl.-fam., 1 

 Th.. abth. 2, p. 432, 1892. 



Falkenberg, Fauna und Flora des Golfes von Xeapel. Monogr. 25, pp. 

 259-261, pi. 24, figs. 16, 17, 1901. 



De Toni, Syll. Alg., vol. 4, sect. 3, p. 812. 1903. 



Oltmauns, Morph. und Biol, der Algen, vol. 2, p. 329, figs. 583, 1 and 3, 

 1905. 



(Eeferences to J. verrucaeformis by Nott (1897), Setchell (1901, 1905), 

 and Setchell and Gardner (1903) are shown below to refer to another 

 species.) 



This species, the type of the geuus, is parasitic on Lauroicia 

 oMusa, growng scattered over its stem and branches, often occurring 

 at the intersection of two branches and forming a tubercular growth 

 up to 3 or -I mm. in diameter. The stems and branches of the 

 Laurencia are bent at the point of parasitism, the tubercle being 

 situated on the convex side. The color varies from deep yellow 

 through orange to dark red. The surface of the tubercle in the 

 tetrasporic and antheridial plant is somewhat wrinkled or slightly 

 tessellated-warty, as it is also in the young cystocarpic plant. After 

 the development of the cystocarps, however, the surface of the last 

 mentioned plant becomes covered with the projecting, nearly globular 

 cj^stocarps to form a botryoidal mass resembling a raspberry. 



The penetration of the host is by means of a network of slender 

 hyphal filaments. Tetrasporic, antheridial, and cystocarpic plants are 

 known. The tetraspores are subepidermal, in the second or third layer 

 of cells, on the outer surface of the thallus, but are not described as 

 being situated on the sides of conceptacles formed by the enlargement 

 of apical pits, as in the next species. They are cruciately divided. 

 The antheridia are found in broad-mouthed conceptacle-like pits, ap- 

 parently occupying the base and loM'er sides, and are formed of broad, 

 plumose, profusely branched tufts which end in rows of swollen 

 globular cells of a clear yellow color. The procarps are formed in 



