and does not show the axial plan of the Batrachospermaceae. Other 

 essential characteristics are found in the behavior of the zygote and 

 the method by which carpospores are formed. 



LEMANEA Bory 1808, p. 181; emend. C. A. Agardh 1828, p. 1 

 Juvenile stage composed of a branching filament, attached to 

 rocks and other objects in swift-running fresh water; mature plant 

 consisting of tufts of macroscopic, tubular reproductive strands 

 which have regularly placed swellings (nodes) distributed from 

 the tip to the basal stipe; strands generally olive-green, green, or 

 purple, leathery, 1-40 cm. long, with nodes 0.2-2.0 mm. in diameter; 

 antheridia produced at the nodes and carpogonia developed inter- 

 nally, with trichogynes extending to the outside; carpospores formed 

 within the thallus, which is hollow except for an axial filament which 

 is either naked or closely covered with enveloping filaments; juve- 

 nile stage maturing during winter; fruiting strands reaching their 

 mature size in the spring and spores becoming evident in late spring. 



Lemanea fucina (Bory) Atkinson 1890, p. 222 

 PL 136, Fig. 7 



Juvenile stage a mat or tuft 1-2 mm. high, of blue-green or green 

 filaments; fruiting strands generally olive or yellow-green, 2-40 cm. 

 long, with a stipe which is usually cylindric and passes abruptly 

 into the wider portion of the strand above, strands simple or much 

 branched, very dehcate to stout, tips sometimes capillary; antheri- 

 dial papillae and nodes either plane, or prominently raised or 

 swollen; papillae 2-7 at each node; carpospores not developed in 

 the internodes. 



Collected from Stevens Point, Wisconsin, by L. S. Cheney; speci- 

 men in University of Wisconsin Herbarium. 



TUOMEYA Harvey 1858, p. 64 

 A macroscopic, cartilaginous and firm thallus with antler-like, 

 dichotomous branching, brownish-green or gray-green, essentially 

 composed of an axial row of large cells heavily invested by a mass 

 of longitudinal, cortical filaments from which out-turned branches 

 of ellipsoidal cells arise, thus producing a crowded pseudoparen- 

 chymatous cortication; thallus without nodes or whorls of branches; 

 plants monoecious, the carpogonia and antheridia developing in 

 different regions of the same plant, the female near the meristematic 

 apex in the main axils of the young branches. 



[569] 



