28 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



branchlets usually of 1-3 cells, 9-12 //, in diam., blunt tipped; tetra- 

 sporangia sessil, subspherical, 50-65 [x in diam., usually solitary on the 

 outer limbs of lateral branchlets; spermatangia born on the adaxial side 

 of ramuli in small tufts 25-35 /x in diameter (Gardner says "covering" 

 and does not mention "small tufts") ; cystocarps relatively abundant, 

 mostly paired, irregular in form, much elongated in the juvenile stage, 

 enclosed in a thick hyaline membrane; carpospores large, subspherical. 



Type: N. L. Gardner 5035, June, in Herb. University of Calif., 

 Berkeley (296620). 



Type locality: Growing on Phyllospadix, La Jolla, California. 



Mexican distribution: Pacific Baja Calif. — D. 8481, 8566, Isla 

 Guadalupe, intertidal; D. 10429, Bahia de Todos Santos, drift; D. 

 10310, 10 mi. west of Punta Malarrimo, Bahia Vizcaino. 



Callithamnion catalinense sp. nov. 

 PL 9, fig. 1-2 

 Thalli ad 14 mm. alt., partibus basalibus imperfectis, ut videtur, autem, per 

 aliquot rhizoidea multicellularia ramosa, e cellulis inferioribus axis principalis 

 nata, affixi; ramificatio vel 2 vel 3 ordinium; axes principales ad 180 p. diam. 

 e cellulis infra 3.0-3.5 plo longioribus quam latae, supra 2.0-2.5 compositi, 

 irregulariter alterne aut partim unilateraliter, admodum eodem in piano 

 ramosi, cellulis inferioribus axium principalium partim sine ramis; rami 

 ultimi in serie adaxiali secunda bini ad quaternos e cellulis inferioribus rami 

 ferentis orientes, deinde usque ad extremitatem rami ferentis alterne dispositi, 

 e 2-20 cellulis compositi, 1-2 mm. long, ascendentes et incurvati, cellulis ca. 

 aeque longis ac latis, interdum brevioribus quam latae, cellulis 4-5 ultimis ad 

 cacumen terminale reductis; tetrasporangia multa, secundum longitudinem 

 totam ramorum ultimorum necnon interdum penultimorum seriatim adaxialiter 

 nata, elliptica, 50-60 /jl long, sessilia singula aut plura e quaque cellula 

 progredienter evolventia; plantae sexuales non visae. 



Thalli to 14 mm. tall, the basal parts incomplete, but apparently 

 attached by several multicellular, branched rhizoids from the lower cells 

 of the main axes, the branching of 2-3 orders; principal axes to 180 jx 

 in diam. of cells 3.0-3.5 diameters long below, 2.0-2.5 diameters above, 

 irregularly alternately or in part unilaterally branched, essentially in one 

 plane, lower cells of principal axes partially without branches; ultimate 

 branches arising in an adaxial, secund series of 2-4 from the lower 

 cells of the bearing branch, then alternate to the end of the bearing 

 branch, of 2-20 cells, 1-2 mm. long, ascending and incurved, the cells 

 about as long as broad, sometimes shorter than broad, the last 4-5 

 cells reduced to a terminal point; tetrasporangia abundant, borne 

 serially and adaxially along the entire length of the ultimate and 

 sometimes penultimate branches, elliptical, 50-60 ll long, sessile, solitary, 

 or commonly more than 1 developing progressively from each cell; 

 sexual plants not seen. 



Type: Holotype is E. Y. Dawson 8096, Sept. 7, 1949, in Herb. 

 Allan Hancock Foundation. 



