LOW-WATEE, MAEK. 91 



in the Isle of "Wight, on the north coast of Guernsey, 

 on rocks and larger seaweed between tide marks, and 

 in four to ten fathoms water all round the British 

 coast. 



Delesseeia HypoglosstjIT (Proliferous Deles- 

 seria). — The chief characteristic of this pretty species 

 is the repeated proliferous leaflets from the mid-rib. 

 It is very variable. Tufted four to six inches high ; 

 sometimes the first leaf is very narrow, larger ones 

 growing from and upon it. Tubercles round and 

 immersed in the mid-rib about the centre of the leaf- 

 let ; tetraspores in linear lines or spots on each side 

 of the mid-rib. Colour, a pinky red, soon fading in 

 fresh water. Grows on rocks and larger seaweed. 



Delesseeia Rttscipolia and Delesseeia Au- 

 GtrsTissiiiA are variations of the two former, smaller, 

 and scarcely worth the rank of separate species. We 

 pass on to seek another branch of the family, whose 

 first characteristic is having leaves without mid-rib 

 or veins 



NITOPHYLLUM. 



(Xame meaning " shining leaf.") 



Generic character. — Frond plane, delicately mem. 

 branaceous, rose-coloured, without veins, but cellular- 

 like net-work. 



'Fructification. — Capsules or cells containing spores 

 imbedded in the substance of the frond, and granules 

 forming distinct scattered spots. 



