108 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



PLATE 1 



Fig. 1-3. Gymnothamnion elegans (Schousb.) J. Ag., X 94. Fig. 1-2, two 

 axes with essentially simple pinnate branchlets and terminal spor- 

 angia; Fig. 3, a bipinnate axis with sporangia on the tertiary branch- 

 lets (after Feldmann-Mazoyer) . 



Fig. 4 a-c. Platythamnion pectinatum Kylin. Fig. 4a, upper part of an axis, 

 X 112; Fig. 4b, a growing tip, X 273; 4c, a carpogonial branch, 

 X 370 (after Kylin). 



Fig. 4 d-f. Platythamnion r ever sum (Setch. & Gard.) Kylin. Fig. 4d, terminal 

 portion of an axis, X 273; Fig. 4e, a corpogonial branch, X 370; Fig. 

 4f, portion of a mature tetrasporangial plant, X 112 (after Kylin). 



