NO. 1 TAYLOR: PACIFIC MARINE ALGAE 219 



Polycoelia has only one great medullary cell layer where ours is as much 

 as two large and two small cells in thickness. The structure of the de- 

 cumbent crowded Weherella (Schmitz 1897, p. 402; Okamura 1936, p. 

 678) is somewhat closer, but the cystocarps are superficial. It seems im- 

 possible to place this in any accepted genus without discrepancies, but the 

 writer is unwilling to erect a genus for it, since in dredged material 

 features are often environmentally distorted. 



Ecuador: Archipielago de Colon, dredged from 106-110 meters' 

 depth at sta. 190 between I. Santa Maria and I. Santa Cruz, no. 34- 

 351A (cystocarpic, TYPE), 26 Jan 1934. Colombia: Valle, dredged 

 near I. Gorgona, no. 34-493A, 12 Feb. 1934. 



Gruoriaceae 



Plants forming expanded crusts with marginal growth, adhering by 

 the under surface, above forming erect crowded filaments lightly united ; 

 sporangia zonate or tetrapartite ; spermatangia formed on the erect fila- 

 ments; carpogenic branches two to four celled, on the erect filaments, 

 from the fertilized carpogonium by short ooblast filaments making vege- 

 tative unions with assimilatory filaments and ultimately giving rise to 

 gonimoblasts, all of the cells of which form carpospores. 



PETROGELIS J. Agardh, 1862 

 Plants crustose, horizontally expanding on the substratum; attached 

 by a basal layer of flabellate-radiating filaments which does not develop 

 rhizoids, but which bears on top erect filaments loosely associated in a 

 general gelatinous matrix ; sporangia intercalary in the erect filaments, or 

 terminal, single or seriate, irregularly tetrapartite ; spermatangia borne on 

 the ends of the erect filaments; carpogenic branches generally two celled, 

 lateral on the erect filaments ; carpospores formed in small spindle-shaped 

 masses, scattered in the cortical layer. 



Petrocelis sp. 

 Plants forming a smooth blackish crust, drying dull purplish red, 

 indefinitely spreading, the surface dull, splitting somewhat on drying by 

 small vertical clefts; thickness 150-320 fi, showing a hypothallus about 

 one third of the thickness, of somewhat parenchymatous discolored hori- 

 zontal cell rows, these ascending centrifugally to form the epithallus of 

 erect filaments which are sparingly 1-2 times dichotomously branched, 

 4.5-9.3 fx diam. below, 2.0-4.5 /a diam. above, the cells in section rectangu- 

 lar, generally subequal to shorter than broad, rarely longer, the end cells 

 of the filaments contiguous, the smooth surface covered by a firm tough 



