162 



EKYTHEA. 



Explanation of the Plates. 



Plate IV. Adult plant of Eisenia arhorea Arescb., from 

 a photograph. 1-25 nat. size. 



Plate V. Fig. 1. Youngest specimen obtained at San 

 Pedro, showing the Lammarioid stage of the blade. 



Fig. 2. Showing tbe first appearance of the pinnules at 

 the base. 



Figs. 3 and 4. Showing the pinnules in more advanced 

 stages. 



Fig. 5. Showing full development of the pinnules in 

 connection with the blade, which is beginning to become 

 involute at the lower margins. 



All the figures of Plate V are from photographs \ nat. size. 



THE ANTHERIDIA OF CHAMPIA PARVULA. 



By Chakles Palmer Nott. 



Although Champia parvula is an old and familiar species, 

 of which the cystocarpic and tetrasporic forms have been 

 exhaustively studied by various well-known algologists, yet 

 until recently antheridial plants have been entirely unknown. 

 While collecting at Butler's Point, Wood's Holl, Mass., in 

 August, 1895, the writer found, amongst a quantity of cysto- 

 carpic and tetrasporic plants, a single good antheridial 

 specimen. Very careful search on several occasions in the 

 localities where Champia was abundantly growing resulted 

 in the discovery of about fifteen good specimens of antheri- 

 dial plants, upon which the following observations are 

 based. 



An examination of the literature relating to the genus 

 Champia shows that the male plant has never been fully 

 described. The important systematic works such as 

 Agardh (l)i Farlow (2) andHauck (3) do not refer to it, while 



iThe numbers refer to the numbered titles in tbe bibliographical list 

 on p. 167. 



