248 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



The recognition of this species at Isla Guadalupe and at several 

 stations along Pacific Baja California gives it a much wider distribution 

 than was at first supposed. The Pacific Coast specimens, although mostly 

 less mature than some of those collected in the Gulf of California, tend 

 to be somewhat narrower on the whole, and less densely papillate. Some 

 of them show much greater similarity to Grateloupia denticulata Mont, 

 than did the material compared with that species by Howe and con- 

 sidered distinct (Setchell and Gardner 1924, p. 782). A reappraisal of 

 Howe's opinion now seems justified and should be based upon compari- 

 son of an ample series of Peruvian specimens with the Mexican ones. 



Grateloupia prolongata J. Agardh 

 PI. 7, fig. 49 



J. Agardh 1847, p. 10; Kutzing 1867, Tab. Phyc. 17, pi. 24; Set- 

 chell and Gardner 1924, p. 780, pi. 80; Yendo 1914, p. 279; Dawson 

 1944, p. 279; Dawson 1945a, p. 24; Dawson 1945c, p. 66, fig. 1 ; Daw- 

 son 1949, p. 234-235. 



Thalli consisting of several to many branched, ligulate blades from 

 a small discoid holdfast, 8-20 cm. (or sometimes to 50 cm.) tall; pri- 

 mary blades arising from short, compressed, stipitate parts a few mm. 

 long, expanding cuneately to 2.5-10 mm. (sometimes 2-3 cm.) wide, 

 250-400 IX thick, abundantly pinnately branched, the pinnae narrowed 

 to the base and expanding above like the primary blade, to 15 cm. long 

 or more, often in turn pinnately short-branched ; older parts commonly 

 with scattered, short, slender, proliferous branchlets from the blade sur- 

 face; cortex dense, of anticlinal filaments of 5-6 small cells from 1-2 

 layers of larger, irregularly shaped cells bordering on the loosely fila- 

 mentous medulla; medulla sometimes with such sparse filaments as to 

 appear almost as a hollow ; tetrasporangia not in sori, borne in the outer 

 cortex without nemathecial modification; cystocarps embedded in the 

 blade, ostiolate, causing slight elevation of the surface, borne most abund- 

 antly in younger branches ; antheridia not seen. 



Type : Holotype is a collection by Liebmann in the Agardh Herb- 

 arium, University of Lund, Sweden. A fragment and slides showing 

 structure are in HAHF. 



Type locality: "Pochette," Pacific Mexico, probably somewhere 

 on the coast of Oaxaca. 



Pacific coast distribution: California — Cooper 410, Ventura; 

 Silva 53, Whites Point, San Pedro, Oct.; Burch 3912, Laguna Beach, 



