into the internal cavity the numerous parietal spore-tufts, composed of 

 beaded strings of spores. The placentae project irregularly into the cavity, 

 some being very short, others longer, and some almost dendroid. The tefra- 

 spores are collected in oblong, defined so>-i or spots, scattered over the frond; 

 they are triangularly parted, and lodged among the cellules of the cortical 

 layer. The colour is a delicate rose-red, becoming rather darker in drying. 

 The substance is gelatinoso-membranaceous, and the plant in drying adheres 

 closely to paper. 



This is a very remarkable plant, having the general habit, the 

 colour, and the substance of a Halymenia, or of Chrpi/menia en- 

 teromorpha, but with external cijstocarps of the structure nearly 

 of those of ChfEtangium, to which genus it is therefore most 

 allied. From ChcBtangium, however, it differs in cellular struc- 

 ture and gelatinous substance, in the very prominent, not de- 

 pressed or semi-immersed cystocarps, and especially in the te- 

 trasporic fruit, the tetraspores being triangularly divided and 

 grouped together in definite spots or sori, as they are in Nito- 

 pliyllum. 



That it constitutes the type of a perfectly distinct new genus 

 can scarcely be doubted, and I gladly take this opportunity of 

 paying an old debt, by inscribing it with the name of Dr. Bin- 

 der, of Hamburg, an enthusiastic admirer of Algse, the possessor 

 of a noble- collection, which he freely opens for the use of all in- 

 terested in this branch of botany, and to whom I am personally 

 under obhgation for repeated contributions of valuable speci- 

 mens. The plant formerly named Bindera insignis by Professor 

 J. Agardh, and which had previously been named Hypnotkalia 

 Wiglitii by Greville, is a species of the older genus Spgridia. 



Fig. 1. BiNDEUA SPLACHNOIDES, — the natural size. 2. A branch, containing 

 sori. 3. Section through the membrane of the same, showing tetraspores 

 in situ. 4. A tetraspore. 5. A branch, with conceptacles. 6. A section 

 through a conceptacle : — the latter figures variously magnified. 



