264 T. II. BUFFHAM ON REPRODUCTIVE ORGANS OF THE FLORIDEE. 



the antheridial layer, and a line of minute dots just exterior to the 

 cells also exhibits the same tint (fig. 19). A transverse section 

 is serviceable (fig. 20, x200). In this the central cell wall is, of 

 course, a circular ring. Round this radiate irregularly the colour- 

 less oblong cellules, closely adhering, and containing a flask-shaped 

 body, the basal part of which is slightly tinted, the cellules being 

 encircled by a denser periphery. (Weymouth, Aug., 1885. Pre- 

 viously discovered by Mr. E. A. Batters, F.L.S., Sept., 1882.) 



In my former paper I mentioned that curious plant Bostrychia 

 scorpioides Mont. {Helicotliamnion scorpioides K.iitz.), and the 

 rarity of the tetraspores, and particularly of the cystocarps. I 

 made a special search at the same station (near Portland, Aug., 

 1885), and succeeded in obtaining, besides the tetraspores, excel- 

 lent specimens of the cystocarps in all stages from the procarps 

 with trichogynes to the mature fruit. I also found the male plant. 

 The antheridium is of some length, cylindrical, and terminal on the 

 ordinary filaments, rather thicker than these, and pale, the cellules 

 being evidently formed by division of the ordinary coloured cells 

 (fig. 21, X50). 



In the well-known group of calcareous algae, the Corallinacece, 

 one form of reproductive bodies was known in Harvey's time, 

 namely, the zonate tetraspores, but as these were contained in 

 conceptacles they were believed to be the only kind. Since then 

 the true carpospores have been discovered, as also the antheridia ; 

 and in Corallina officinalis Linn., and in some other species, all 

 three kinds of organs are found in conceptacles of similar form, 

 though differing slightly. The order has therefore been raised to 

 the highest position in the Floridece. So rare, however, are the 

 sexual organs that Bornet found, while examining hundreds of 

 specimens, only three bearing antheridia and one with cystocarps. 

 After macerating some plants in dilute hydrochloric acid I observed 

 one with male conceptacles. The base of the cavity of the con- 

 ceptacle is lined with minute fibres on which the antherozoids are 

 borne. (Brighton, June, 1885.) 



In Jania corniculata Lamour. both male and female conceptacles 

 are found on the same plant, the former being longer and narrower 

 than the latter, and not corniculated. The antherozoids appear to 

 be on shorter filaments than in the preceding species. (In a mis- 

 cellaneous gathering by a non-algological friend at Falmouth, 

 June, 188G.) 



