58 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



Costa Rica: In tufts of Galaxaura, Golfo Dulce, no. 39-108 (in 

 minor part) 26 Mar. 1939. Ecuador: Archipielago de Colon, incon- 

 spicuous tufts in the littoral near Black Beach Anchorage, I. Santa Maria, 

 no. 34-229B, 18 Jan. 1934. Guayas, on the rocky southeastern side of 

 Pta. Santa Elena, no. 34-461, 8 Feb. 1934. 



SPONGOMORPHAKiitzing, 1843 



Spongomorpha conjuncta n. sp.^^ 

 Plate 2, Figs. 7, 8 



Plants 2-4 cm tall, tufted, dark green drying to a brownish green; 

 many primary filaments conjoined to a common base bound together by 

 slender descending filaments from the lower branches; lower primary 

 filament cells to about 5-6 mm long, somewhat tapering downward, 

 smooth, 330-440 ju, diam. at the top ; branching alternate below, the fila- 

 ments about 220-350 /* diam., the cells 5-6 diameters long, somewhat 

 tapering, intermediate branching alternate or opposite; upper branchlets 

 fasciculate, closely unilateral on the upper side of the branchlets, 150-220 

 fi diam., the cells 3-5 diameters long, the tip cells a little tapered, obtuse, 

 about 5-7 diameters long. 



These little plants remind one of small Cladophora fultginosa in the 

 Caribbean. However, the bases are very definitely united by rhizoids into 

 short, tough axes. From C. graminea they diflFer in the coarser filaments 

 and fasciculate, unilateral upper branching. From C. prolifera the bases 

 again distinguish them, as well as the absence of opposite branching in 

 the upper portions. 



Ecuador: Archipielago de Colon, rare and inconspicuous in the 

 littoral, I. Santa Maria, no. 34-229 A (TYPE), 17 Jan. 1934. 



Dasycladaceae 



Plants with regular whorls of branches on the simple, generally uni- 

 cellular and unbranched axis, the uniseriate branches multicellular, coeno- 

 cytic, with limited growth or, in some genera, establishing secondary axes, 

 frequently tipped by deciduous hairs; ultimate divisions becoming spo- 

 rangial, or bearing specialized sporangia, in which aplanospores are pro- 

 duced. 



4S Spongomorpha conjuncta n. sp. — Planta caespitosae, 2-4 cm altitudine, fila- 

 mentis prope basim per filamenta descendentia desuper junctis; filamentis primariis 

 330-4-4-0 |Li diam., cellulis 5-6 mm long., ramificatione infra alterna, media in parte 

 alterna aut opposita, supra fasciculata, ramulis unilateralibus 150-220 ]i diam., 

 cellulis 3-5 plo longioribus quam latis. Planta typica in loco dicto I. Santa Maria, 

 Ecuador, legit W. R. Taylor no. 34-229A, 17 Jan. 1934. 



