NO. 1 TAYLOR: PACIFIC MARINE ALGAE 239 



GYMNOGONGRUS Martius, 1833 

 Plants small, bushy, repeatedly forking; firm to horny in texture, the 

 branches flat to cylindrical, sometimes proliferated; medulla of angular 

 rounded cells, the cortex of small cells in anticlinal rows; sporangia in 

 nemathecia, irregularly tetrapartite. 



KEY TO SPECIES 



1. Branch segments compressed 2 



1. Branch segments terete or nearly so G. Griffithsiae v. galapagensis 



2. Branching spreading, increasingly close and corymbiform above, 

 breadth uniform throughout G. Smithii 



2. Branching more erect, rather irregular, the lower segments com- 

 monly wider than the upper G. martinensis 



Gymnogongrus Smithii n. sp.^^^' ^^"^ 

 Plate 80, Fig. 1 



Plants forming small tufts to 3.5 cm tall, dull red in color, regularly 

 polychotomously divided, the intervals less toward the tips, the branches 

 rather erect, of equal length, producing an even corymbose habit; seg- 

 ments compressed, diameter throughout very equal, 0.75-1.20 mm, thick- 

 ness 0.50-0.65 mm, slightly broader below a fork and a little tapered 

 down to the next division point; apices quite blunt, rounded to truncate 

 or emarginate; texture fleshy; in section showing a large medulla of 

 thick-walled cells which are somewhat more regular in arrangement 

 toward the outer part and moderately sharply grade into the close radial 

 rows of 4 or 5 small cells which make up the cortex; spermatangia 

 spindle shaped, formed in colorless patches on the upper 1-2 divisions, 

 covering the breadth of the segment. 



This species is smaller than G. leptophylliis J. Agardh (Kylin 1941, 

 p. 26), more regularly branched, and of firmer texture, at least as judged 

 by Phyc. Bor.-Amer. no. 239a. It somewhat resembles G. tenuis also, but 

 the relatively thicker, narrower segments are of more constant dimensions. 



Ecuador: Archipielago de Colon, in the high littoral near Black 

 Beach Anchorage, I. Santa Maria, no. 34-241 (cystocarpic and sperma- 

 tangial, TYPE), 17 Jan. 1934. 



146 Gymnogongrus Smithii n. sp. — Planta ad 3.5 cm altitudine, polytoma, inter- 

 vallis inferioribus longioribus quam superioribus, segmentis compressis, ad 0.75- 

 1.25 mm diam., 0.50-0.65 mm crass., apicibus obtusis; cystocarpis paryis.subin- 

 flatis, singulis ad cacumlna ramorum ; sperraatangiis in maculis in 1-2 divisjonibus 

 summis. Planta typica in loco dicto I. Santa Maria, Ecuador, legit W. R. Taylor 

 no. 34-241, 17 Jan. 1934. 



14 7 Named in appreciation of the contributions of Professor G. M. Smith to our 

 knowledge of Pacific coast marine algae. 



