88 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



7. Tetrasporangia produced mainly in small sori scattered be- 

 tween or along the nerves 9 



7. Tetrasporangia borne in small marginal proliferations 8 



8. Veins narrower, strongly marked; color brownish red 



.... P. antarctica (Skottsberg) Skottsberg (Grahamsland) 



8. Veins broader, less strongly marked; color reddish 



P. sinuosa (Huds.) Kiitz. (North Atlantic) 



9. Marginal teeth 2-3 mm. long, very prominent 



P. riggii Gardner (Alaska) 



9. Marginal teeth short, not so prominent 10 



10. Blades exceedingly ample, broader than long 



P. amplissima sp. nov. (Gulf of Calif.) 



10. Blades or segments not particularly ample, usually dis- 

 tinctly longer than broad 11 



11. Marginal teeth often developing into bundles of rhizoids; 

 tetrasporangia in very small (250-350 jx) scattered sori in the 



alae P. lucasana sp. nov. (So. Baja Calif.) 



11. Marginal teeth not developing into bundles of rhizoids; tetras- 



porangial sori larger 12 



12. Tetrasporangia in irregular patches along veins in main 



blades P. fimbriata (De la Pyl.) Kylin (subarctic) 



12. Tetrasporangia in scattered sori between the side nerves 13 



13. Blades more undulate, broader 



P. setchellii Skottsberg (Pacific North America) 



13. Blades less undulate and denticulate, more lingulate 



P. quercifolia (Bory) Skottsberg (Falkland Isl.) 



Phycodrys lucasana sp. nov. 

 PL 37, fig. 7-8; PL 43, fig. 1 



Thalli ad 5 cm. alt., delicate membranacei, ex una lamina ramosa infra 

 stipitem brevem (2 mm.) teretem admodum contantes; lamina primaria ad 

 13 mm. lat., lanceolata, costam tenuem (100-150 fj.) sed manifestam, necnon 

 nervos tenuissimos oppositos, e duobus ordinibus cellularum plerumque 

 constantes, praebens; margines primum valde denticulati, aliquibusdam dentium 

 in fasciculos rbizoideorum teretes simplices ramososve effectis, aliis ramos, ad 

 basim latos, laminae primariae similes plerumque formantibus; tetrasporangia 

 in soris parvis sparsis punctatis in alis laminarum nata, soris 250-350 (i 

 diam., 25-35 sporangia habentibus; reproductio sexualis non visa. 



Thalli to 5 cm. tall, delicately membranous, consisting essentially 

 of a single branched blade below a short (2 mm.) terete stipe; primary 

 blade to 13 mm. wide, lanceolate, with a slender (100-150 /x) but 

 distinct midrib and very slender, opposite nerves mostly of two cell 

 rows; margins at first strongly denticulate, some of the teeth developing 

 into terete, simple or branched rhizoid bundles, others forming usually 

 broad-based branches similar to the primary blade; tetrasporangia borne 



