ON SOME NEWLY-FOUND ANTHERIDIA. 343 



coloured granules of the filament : the appearance is velvety and 

 beautiful. In Fig. 2 I have but feebly succeeded in indicating these 

 different appearances. The antheridia, in fact, form a colour- 

 less layer round the coloured dissepiments on the upper branches to 

 the apices, and on the short lateral dichotomous ramuli. With 

 £ inch x 200, as in Fig. 3, the antherozoids are seen to be pretty 

 closely set by a prolonged pedicel in the colourless investment 

 of the dissepiments, radiating from the filament. A tendency 

 to cluster round several centres can be perceived. 



Cer. strictum is a slenderer and more delicate plant. Fig. 4 

 shows two dissepiments — with and without antheridia — x 50. As 

 the colour is brighter the peculiar velvety look is even more striking 

 than in diaphanum. 



In fig. 5, as shewn with -J- inch x 300 the antherozoids are 

 minuter and more closely set than in the other species, but the 

 general characters are alike in both. 



At Teignmouth, in Aug., 1881, Poly siphonia fibrillosa was found 

 bearing antheridia. They have the general characters of that fruit 

 in this genus. 



P. elongata has, however, large antheridia, which are very copious 

 at the apices of the filaments, of conical form, with the axis much 

 prolonged beyond the antherozoids. This I took at Folkestone in 

 April, 1882. 



There is yet ample work to be done before the fruits of all our 

 native red algas have been carefully observed with suitable powers, 

 and their special features described and delineated. As already in- 

 dicated, this refers more particularly to the antheridia than to the 

 tetraspores and cystocarps. 



But even as regards the latter I may give an instance. In the 

 " Phy. Brit." Harvey figured Helicothamnion scorpioides, one of 

 the most remarkable of the Florideae, with its ramuli rolled in- 

 wards in spirals. But although he gave a number of localities he 

 was unable to draw any fruit, as his herbarium only contained 

 barren specimens. I believe, however, that tetraspores in stichidia 

 have since been seen by several collectors. In a quantity sent me 

 by Mr. E. M. Holmes, which he gathered near Portland Station in 

 Aug., 1882, this fruit was not uncommon, as he had of course 

 observed. On looking it over carefully I found one small fragment 

 very rich in cystocarps, and although only enough for one slide, it 

 is so characteristic, and unlike any other alga, that it will enable 



