1914] Setchell: Parasitic Florideae, I 15 



The antheridial plant Cpl. 2, figs. 11. 14) is nearly globnlar. a])out 

 3 mm. in greatest diameter. The tubercle is flattened and thin and 

 the free arms bearing the male coneeptacles short. 0.2-0.6 mm. in 

 length. 



The cystocarpic plant (pi. 2, figs. 9, 12) reaches a greatest diameter 

 of about 5 mm., is flattened globular, and has sprawling free branches 

 up to about 2 mm. in length. 



The tetrasporangia are subepidermal and tripartite on the outer 

 surfaces of the free branches. 



The antheridial coneeptacles arc single or d()ul)le {\)\. 6, figs. 31, 

 32) at the tips of the free branches, which are slightly enlarged above. 

 The coneeptacles are ellipsoidal and the plumose antheridial tufts 

 line the entire cavity radiating towards the center. The plumose tufts 

 are shorter and less regular than in J. moriforniis and J. Gardneri, 

 approximating the shape of those of J. Solmsii and J. verrucaeformis, 

 but being, however, more plumose and less bouquet-like. 



The cystocarps are mostly single in the slightly enlarged apex of 

 the free arm (1.0-1.5 mm.) with a moderately thick pericarp. 



Janczewskia lappacea differs from J. moriformis and J. Gardneri 

 in proportions chiefly, viz., in general dimensions and in proportion 

 of length of free branch to thickness of tubercle, these two giving the 

 plants a decidedly different aspect. It differs also somewhat in details 

 of the shape of the antheridial clusters. From J. verrucaeformis and 

 J. Solmsii it differs fundamentally in arrangement and shape of anthe- 

 ridial clusters as well as in the much greater development of free 

 branches. It is probably closely related to J. tasmanica Falk., and a 

 comparison of the two species is to be found under the latter. 



It has been collected on several occasions in as many years by 

 Dr. N. L. Gardner, parasitic on Chondria 7iidifica in the waters of 

 Southern California in the neighborhood of San Pedro. 



