NO. 1 TAYLOR: PACIFIC MARINE ALGAE 263 



The present very delicate and well-developed specimens adhere closely 

 to mounting paper. Sonder's //. Preissii (Kiitzing 1862, p. 19, pi. 62d-e), 

 of which what appears to be original material is available, is much smaller, 

 thicker, and has sharply serrate blades and obtuse-tipped free filaments. 

 Kiitzing's H. africanum (1862, p. 19, pi. 63d-f) is simply rounded and 

 has very short blunt free filaments 3-4 cells long. Montagne's H. Duper- 

 reyi (Montagne 1842, p. 28, pi. 7, fig. 1 ; Kutzing 1862, p. 19, pi. 62a-c; 

 Weber-van Bosse 1923, p. 315; Howe 1920, p. 580) likewise is smaller, 

 thicker, and has short, divaricate-branched, blunt-tipped free filaments. 

 The shape of the plant is not particularly distinctive. In the specimens of 

 the Tres Marias collections the delicacy of the soft, thin plants is notable, 

 the m.eshes being barely visible to the unaided eye. The peripheral fila- 

 ments arise at the mesh nodes and occasionally between them as well. On 

 a single base but one filament arises, which bears alternately two to four 

 erect somewhat incurved branches, and these in turn may each have a 

 secondary branch, but the number of tips in a group is seldom as high as 

 eight. The apices are very acute. Mme. Weber-van Bosse's H. Duperreyi 

 v. sublittorale is reported with dichotomously branched free filaments; 

 the type of the species probably has them likewise dichotomous, but Howe 

 does not state that they branch in his subsp. spinulosum, though he does 

 say that two or three are present. 



Mexico : Nayarit, dredged at sta. 970 from a bottom of coralline and 

 other algae, I. Maria Magdalena, Las Tres Marias, no. 39-644 (tetra- 

 sporic, TyP£),9May 1939. 



SPERMOTH AMNION Areschoug, 1877 



Spermothamnion phycophilum n. sp.^^* 

 Plate 4, Figs. 1, 2 



Plants growing in dense soft spreading tufts, to 3-5 mm tall, dull 

 brownish red, with creeping filaments bearing hapteral branches on the 



164 Spermothamnion phycophilum n. sp. — Planta caespitosa, ad 3-5 mm alti- 

 tudine, in filamentis serpentibus haptera ramosque erectos ferens; filarnentis erectis 

 simplicibus aut sparsissime alterneque ramosis, 36-72 \i diam., cellulis cylindricis, 

 60-180 \i long., supra, ad 25-40 M- diam. decrescentibus; planta tetrasporangia 50- 

 70 ^i diam., primo 4-6 in serie unilateral! prope partem mediarn axis fertilis, in 

 stipitibus sursum curvatis ferente, postea sporangia secundaria^ infra proferente; 

 spermatangiis in serie unilaterali prope partem extremam axis fertilis; plantis 

 cystocarpicis ramos divergentes habentibus, cystocarpis singulis ad cacumen axis 

 primarii ramorumque fertilium unius vel duorum, crescentibus ad circa 180 fx 

 diam.; carposporangiis 30 jx diam. Planta typica in loco dicto I. Santa Maria, 

 Ecuador, legit W. R. Taylor no. 24-397, 30 Jan. 1934. 



