252 p s t e I s i a 



unless it be depth of water; holdfast, the 

 simple primitive disc enlarged, without any 

 trace of hapteres arising higher up on the 

 stipe, though often in the disc itself showing 

 local secondary growth, manifesting itself as 

 radial thickenings and even closely appressed 

 branches (Plate III., Fig. 2), as is also the case 

 in CynialJicyc triplicata l)ut not so conspicuous 

 as in that ])hint. The largest holdfast collected 

 measures about 20 millimeters in width; often 

 they are much smaller not exceeding 8 milli- 

 meters. Mucilage ducts are absent from both 

 stipe and lamina. 



Fruiting habits very variable; sometimes 

 very small apparently young specimens are 

 found in fruit. I have specimens with well 

 developed sori the dimensions of which are 

 as follows: (a) (Plate XVI., Fig. 10) lamina 8x3.3 

 centimeters, sorus orbicular, about 25 milli- 

 meters in diameter, stipe 35 millimeters, hold- 

 fast 7 millimeters; (b) (Plate XVL, Fig. 2) lamina 

 12.5 X 2 centimenters, sorus elliptical, 37 x 13 

 millimeters, stipe 4 centimeters, holdfast 7 

 millimeters. On the other hand I have several 



