180 ALLAN HANCOCK PACIFIC EXPEDITIONS \OL. 17 



PLATE 4 



Fig. 1. Scinaia latifrons Howe. Part of an antheridial plant of 



D. 136-40, Isla Tiburon, Sonora. X 0.9. 



Fig. 2. Gloiophlora confusa Setchell. A mature cystocarpic 



plant from D. 3526, near Guaymas, Sonora. X 0.9. 



Fig. 3. Gelidium crinale (Turner) Lamx. Transection of a 



plant from Isla Guadalupe, showing abundant and 

 widely scattered rhizoidal filaments. X 200. 



Figs. 4-5. Gelidium criiiale var. luxurians Collins. Fig. 4. Tran- 

 section of a syntype specimen from P. B. A. #1139, 

 Pacific Beach, Calif., showing restriction of rhizoidal 

 filaments to the median area. X 200. Fig. 5. Tran- 

 section of a specimen of D. 8774, San Quintin penin- 

 sula, Baja Calif., showing extreme reduction and 

 restriction of rhizoidal filaments to the central medul- 

 lary line. X 200. 



Fig. 6. Gelidium coronadensc Dawson. Part of a tetrasporic 



plant of the type collection, D. 4223, Islas Los Corona- 

 dos, Baja Calif., showing the sterile margins of the 

 elongated sori. X 10. 



