30 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



one or two orders of alternate branches, the cells 7-12 /x in diam. and 

 mostly about 3 diameters long, the upper branches more slender and the 

 cells longer, the tips blunt; tetrasporangia tetrahedrally divided, ovoid, 

 lateral (or rarely terminal), sessile on the erect filaments, 20-23 /x wide, 

 23-28 /x long; cystocarps small, apparently with but a single lobe, 

 commonly arising from the second or third cell of a main external axis; 

 spermatangial plants not seen. 



Type: Ivan M. Johnston no. 53b, April, in Herb. California 

 Academy of Sciences, San Francisco (1363). 



Type locality: Growing in the fronds of Grateloupia prolongata, 

 Isla San Esteban, Gulf of California. 



Mexican distribution: Gulf of Calif. — D. 1765a, endophytic in 

 Grateloupia hancockii, Bahia Bocochibampo, near Guaymas. 



Callithamnion lejolisea Farl. 



PL 8, fig. 1, 2 

 Farlow 1877, p. 254. Rhodochorton amphiroae as interpreted by Smith, 1944, p. 

 183, pi. 40, fig. 5-7 



Thalli 1-2 mm. high, forming tufts between the integenicula of 

 articulated corallines (Bossiella and Calliarthron) , attached by a pul- 

 vinate mass of rhizoidal filaments and prostrate branchlets wedged 

 between the segments and partially penetrating the genicula; erect 

 filaments 20-40 /x in diam., often slightly dilated in mid-parts, terminally 

 blunt, not at all attenuated, sparsely irregularly multifariously branched, 

 the cells 1-2 diameters long; tetrasporangia terminal on short, 1-3-celled 

 branchlets in lower parts of plant, ovoid, about 35 [x long; cystocarps 

 terminal on short branchlets near the base of the plant, consisting of a 

 subspherical gonimoblast to 50-100 /x in diam. of densely compacted 

 carpospores; spermatangia forming terminal, elongate-capitate clusters 

 on short branchlets. 



Type: A collection by Mrs. E. Snyder in the Farlow Herbarium, 

 Harvard Univ. 



Type locality: San Diego Calif, [on a fragment of Calliarthron]. 



The type of this species has apparently not been reviewed since 

 the plant was described 84 years ago. Although not marked as such, the 

 type seems to consist of two small bits of a Calliarthron glued to separate 

 cards and labeled as above. Examination of these has revealed tetra- 

 sporangia and cystocarps in agreement with Farlow's description and 

 also with Smith's figures which, unforunately, have been associated for 

 the past two decades with Rhodochorton amphiroae Drew. The latter is 

 a distinct plant reproducing by monospores, and with much more 

 slender filaments, but otherwise of similar size and habit. 



Mexican distribution: Pacific Baja Calif. — D. 9117, Islas San 

 Benito, on Bossiella. This and several collections from the southern 

 California area had been erroneously identified as Acrochaetium amphi- 



