276 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



8. Thalli 20-45 cm, tall; segments 1.5-2.5 mm. broad 



Z. lanceolata 



8. Thalli usually under 20 cm. tall; segments 1 mm. broad 



or less 9 



9. Secondary pinnae not strongly determinate, 15 mm. long or 



more Z. delicatula 



9. Secondary pinnae strongly determinate, 2-5 mm. long 



Z. mexicana 



Zanardinula andersoniana (Eaton) Papenfuss 

 P1.4,figs. 35-36;pl. 17,fig. 62 



Papenfuss 1944, p. 342; Dawson 1945c, p. 66; Dawson 1949, p. 

 222, 225, Prionitis andersoniana Eaton, ex. J. Agardh 1876, p. 159; 

 Kylin 1941, p. 11 ; Smith 1944, p. 246, pi. 57, f. 3. 



Thalli 20-50 cm. tall, deep red in color, firm in texture, consisting 

 of one to several irregularly branched, flat axes from a small discoid 

 holdfast; lower parts of main axes and branches narrow, 1.5-3 mm. 

 wide; upper branches of variable width, but in part 5-15 mm. broad, 

 usually tapered both to base and apex; secondary (proliferous) branch- 

 ing pinnate-distichous, irregular and remote to ± regular and approxi- 

 mate, the branches indeterminate, linear-lanceolate and up to 20 cm. 

 long; transection 250-350 fj. thick, showing a structure of three distinct 

 tissues ; outer cortex of anticlinal rows of 4-6 small, squarish, pigmented 

 cells 4-5 /x in diameter ; subcortex of 2-4 irregular layers of pale, rotund 

 cells 10-30 p. in diameter and with granular contents; medulla of densely 

 packed, intertwined, ± longitudinal filaments 4-7 fi in diameter; cysto- 

 carps numerous, scattered in upper segments, embedded and causing 

 little or no swelling of the surface, ostiolate ; antheridia not seen ; tetra- 

 sporangia cruciate, long-elliptical, 25-28 ju, long, borne in extensive, ± 

 linear, nemathecial sori on either or both surfaces of older segments, the 

 sori often occupying the width of the segment except for a narrow, 

 sterile margin, the nemathecial filaments 8-10 cells long. 



Type: Holotype not designated, but the original collection by C. 

 L. Anderson, No. 59, consisting of two fertile and one sterile specimens, 

 is in the Agardh Herbarium, University of Lund, Sweden. 



Type locality: Santa Cruz, Monterey Bay, California. 



Mexican distribution : Pacific Baja Calif. — Cooper 539a, Playa 

 Rosarita, Mar. ; D. 234, Jan., D. 5277, Sept., Punta Descanso ; Cooper 

 789, Punta Santo Tomas, Mar.; Hubbs, 12/18/45, Punta Clara, Dec; 

 D. 17, Jan., D. 6467, Mar., D. 5175, Sept., Cabo Colnett; D. 123, 



