40 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



Bahia San Jose del Cabo, Baja Calif.; D. 3118, Nov. 4, 1946, near 

 Cabo Pulmo, Baja Calif. 



This plant proved difficult in the interpretation of the carpogonial 

 branch, for the unfertilized carpogonial branches are not abundant, do 

 not stain very deeply and are very small. Following the first transverse 

 divisions of the fertilized carpogonium, the cystocarp develops a promi- 

 nent involucre and the carpospores are borne on a cluster of branched 

 gonimoblast filaments. The several illustrations attempt to show some of 

 the various early stages observed in the development of the carpogonial 

 branch and of the cystocarp. 



The closest affinities of L. magniinvolucra may be with Liagora 

 clavata Yamada, but that species is not sufficiently known for complete 

 comparison. It seems to differ at least by its 4-5 celled carpogonial 

 branches. From both L. mucosa Howe and L. orientalis J. Ag., which 

 are similar dioecious species, the present plant differs in its smaller size 

 and more slender segments, in its prominent involucre of long, slender, 

 ascending filaments, and in its fewer-celled carpogonial branch. 



Liagora orientalis J. Agardh 

 Plate 17, fig. 1 



J. Agardh, 1896, p. 99; Yamada, 1938, p. 4-6 (in part), pi. 1, text 

 figs. 1, A-C only; Yamada, 1944, p. 18. Liagora formosana Yamada, 

 1938, p. 32-34, pi. 14-15, text figs, 2-22. 



Thalli saxicolous, to 15 cm. high, extremely soft and lubricous, 

 abundantly irregularly, pinnately, multifariously branched, sometimes 

 paniculate; branches cylindrical, about 1 mm. diam. above, to 2.5 mm. 

 in diameter at the base, whitish in color ; calcification light, mainly axial ; 

 assimilatory filaments several times dichotomously, corymbosely branched, 

 the cells below narrow, elongate- cylindrical, above short-clavate to 

 ovate, 9-11.5 /* in diameter; plants dioecious; antheridia borne in clusters 

 on the ultimate cells of the assimilatory filaments; carpogonial branches 

 usually 3-celled, about 25 /a long exclusive of trichogyne, lateral, some- 

 what curved ; gonimoblast developing from upper cell of carpogonial 

 branch, the remaining cells soon becoming obscured ; cystocarp with a 

 compact, hemiglobose gonimoblast usually 110-130 ^ in diameter stand- 

 ing above a smaller mass of short, coarse, entangled involucral filaments. 



Type : Holotype not designated, but the original specimen collected 

 by W. Ferguson is probably in the Agardh Herbarium, University of 

 Lund, Sweden. 



