THE MARINE BOTANIST. 163 



tion : 1. raised tubercles (coccidia)^ sessile on the 

 fi'ond containing spores ) 2. tetraspores forming 

 distinct scattered spots. 



NITOPHYLLUM PUNCTATUM.— DOTTED 

 NITOPHYLLUM. 



Substance of the fi'ond in this species exceed 

 ingly thin and dehcate, entirely without veins. 

 At first the frond is broadly wedge-shaped, after- 

 wards it is regularly divided into forked segments, 

 which still preserve their wedge-shaped outline; 

 in the variety /3 ocellatum the frond is cleft nearly 

 to the base with narrow, and many and regularly 

 divided segments. The spots of tetraspores form 

 either round, oblong, or linear dots of large size 

 scattered over the whole frond, or confined to its 

 divisions 5 tubercles globose, and thickly distri- 

 buted over the surface. Grows attached to various 

 algae between and beyond tide-marks. Annual. 

 Summer. " The usual size of this plant is from 

 four to twelve inches long, and about as broad, 



