76 ■ AET. 12. K. YENDO. 



in a row; but they are usually confined to the lower half of 

 the leaf. 



The leaves on the lower portions of the sterile lateral branches 

 are similar to those above described in every respect, but usually 

 much smaller. On the terminal portions of a frond they are much 

 narrower and extremely delicate and membranaceous (PL X. fig. 7): 

 often deeply alternately pinnatisected with the sini deep and the 

 segments ascending, sometimes shallowly dentated or even undul- 

 ated; and sometimes with the apices of the leaves acuminate or 

 spathulate. These variations are often met with in one and the 

 same individual. 



Vesicles are cylindrical, 10-14 mm. in length and 2-2.5 mm. 

 in diameter. The apex of a vesicle ends abruptly in a simple, 

 serrated crown leaflet with a long petiole, and the base in a short 

 stalk. Many vesicles are usually found disposed in a raceme or 

 cyme on the lower portion of a ramule. 



Receptacles are cylindrical and terminal on a ramulet. Tlie 



male and female receptacles are found on different individuals and 



differ in their external shape as has been described by Kützing'^ 



though somewhat inadequately. The male receptacles are long and 



homogeneously cylindrical, mucronate above, and ending abruptly 



in a short stipe below (PI. X. fig. 6). The female ones are much 



thicker and shorter, more or less attenuated upwards, and equally 



mucronate at the top (PI. X. fig. 5). The coneeptacles of both 



sexes begin to ripen first at the upper portion of a receptacle and 



then gradually lower down. Those that are discharging their 



contents are much swollen resulting in a much larger diameter in 



that part of the receptacle. . Kutzing's figures-^ illustrate the stage 

 ^ ^ - 



1) Phyc. Gen. p. 3G5. 



2) Tab. Phyc. Bd. X. T:if. 89. fig. c. 



