THE MARINE BOTANIST. 109 



the River Dart. Mouth of the River Otter, at 

 Budleigh Salterton, Miss Cutler. Tydd Marsh, 

 Cambridgeshire. Shore of Blackwater, near Mal- 

 don. Plymouth. Barmouth. Pool near Dolgelly, 

 and at the Menai Bridge. Port Stewart, Ulster. 

 Baldoyle, River Shannon, at Tarbert. 



RYTIPHL^A. 



Name from a wrinkle and the hark, in allusion to the 

 appearance of the surface when dry. 



Frond filiform or compressed, pinnate, trans- 

 versely striate, reticulated ; outer surface composed 

 of several rows of minute, irregular, coloured cel- 

 lules. Fructification, 1. Ceramidiay containing 

 pear-shaped spores. 2. Tetraspores, contained in 

 stichidiaj or in the swollen ramuli. 



RYTIPHL^A PINASTROIDES. — HOOKED 

 RYTIPHL^A. 



Frond from four to eight inches high, round, 

 almost devoid of branches at the base; much 



