496 ALLAN HAXCOCK PACIFIC EXPEDITIONS VOL. 12 



PLATE 90 



Fig. 1. Dilcsscria Hancockii. A major portion of a well-de- 

 veloped individual. The lower part of the axis appears 

 near the left-hand margin of the plate, but the holdfast 

 is lacking. There are a few proliferous branches near 

 the base, and then a long stem (derived from the de- 

 nuded midrib) loops across the plate, curving beyond 

 the lower and left-hand margins. It bears one lateral 

 blade and ends in a very large terminal one, which is 

 disintegrating belo^v and somewhat damaged about the 

 tip, presumably by the dredge. It shows the midrib and 

 pinnate lateral veins, the sterile region in the center, 

 and the tetrasporangial sori between the veins outside 

 this. I. Santa Cruz, x 0.6. 



