284 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



sori confined mainly to the secondary pinnae, the sori covering most of 

 the flattened surfaces, or often the entire pinna, cruciate, long-elh'ptical, 

 about 30 fji long and 11 /x wide, the degree of nemathecial modification 

 of the fertile cortex variable; cystocarps confined mainly to secondary 

 pinnae, embedded, ostiolate, abundant and often crowded, 200-300 fx in 

 diameter, the gonimoblast prominently pedicellate from the auxiliary 

 cell; antheridia borne in nemathecial sori on the secondary pinnae, the 

 outer cortical cells becoming transformed in the nemathecium into sunken 

 antheridia and overarching, clavate paraphyses. 



Type: Holotype is a collection by David Douglas, without date 

 or number, in the Harvey Herbarium, Trinity College, Dublin, Ireland. 



Type locality: Monterey, California. 



Mexican distribution: Pacific Baja Calif. — Cooper 537, Playa 

 Rosarita, Mar. ; D. 277, 8 km. south of Punta Descanso, Jan. ; Cooper 

 791, Punta Santo Tomas, Mar.; C. Johnson, Aug. 1945, Bahia Soledad; 

 D. 59, 59a, Cabo Colnett, Jan.; D. 186, near mouth of Rio San Telmo, 

 Jan.; D. 8762, Punta San Quintin, Jan.; D. 8827, Jan., D. 1192, 1208, 

 Apr., Punta Baja; D. 8657, 8685, Bahia Rosario, Jan.; D. 9779, Apr., 

 Taylor 633, Mar., Isla Cedros; D. 2789, Punta Santa Rosalia, Oct. 



The development of the carposporophyte in this species has been care- 

 fully worked out by Sjoestedt (1926). The structure and nemathecial 

 tetrasporangial sori are well illustrated by Harvey (1853). 



Distinctive characters in this species seem to be found in the irregular 

 primary branching, the determinate growth and commonly deciduous 

 nature of the secondary pinnae, and the confinement of reproductive 

 structures to the pinnae. 



Zanardinula delicatula (Taylor) comb. nov. 



Prionitis filiformis f. delicatula Taylor 1945, p. 210, pi. 66, fig. 1. 

 Zanardinula filiformis f. delicatula (Taylor) Dawson 1945b, p. 94; 

 Dawson 1951, p. 53. 



Thalli up to 13 cm. tall, bushy, blackish-purple in color, tough, 

 cartilaginous when dry, consisting of several much-branched, flattened, 

 erect axes about 1 mm. broad from a relatively broad discoid holdfast; 

 primary' branching irregular, at variable intervals ; secondary branch- 

 ing essentially pinnate, but not strictly distichous, relatively dense, 

 especially in upper parts; pinnae at variable intervals but often grouped 

 1 mm. apart or less, simple, commonly rather uniformly 15 mm. long. 



