NO. 1 TAYLOR: PACIFIC MARINE ALGAE 165 



Setchell & Gardner 1937, p. 92, pi. 25, fig. 48. 



The old material from I. Santa Maria is particularly confusing. No 

 filiform terminal branchlets are present. The branches reach nearly 3 mm 

 diam. throughout the plant and end in crowded subspinescent branch 

 clusters. The histological features show its true nature quite clearly, but 

 its form does not; it probably consists of quite old, abraded, proliferous 

 specimens. Farlow (1902, p. 99) reports O. filiforrnis J. Ag., but the 

 plants probably belong to the present Pacific species. His specimens are ill 

 developed, particularly the fragment from I. Isabela, though those from 

 I. Wenman are better. His material from Iguana Cove, I. Isabela, desig- 

 nated (1902, p. 96) ? Gracilaria rugulosa is also O. Crockeri. 



Examination of material from the West Indies in the writer's herba- 

 rium, especially Arndt no. 177 from Haiti, showed 2-6 discolored axial 

 cell rows, and examination of branchlet apices showed tolerably consist- 

 ently two apparently equal apical cells, which De Toni (1905, p. 2) 

 specifies as a characteristic of the genus. In only a very few cases did it 

 appear possible that there were two apical cells at branchlet tips of the 

 Galapagos material, and no clear case was seen. The highly refractive 

 (mucus?) cells observed in the cortex region of the Galapagos material 

 were not so marked in the Haitian material, but especially in a spermatial 

 piece were abundant in the younger portions, though small and not re- 

 fractive. They were not recognizable in sections near the base of the plant. 



Ecuador: Archipielago de Colon, on rocks south of Banks Bay, I. 

 Isabela, no. 34-129, 13 Jan. 1934. Ibid., intertidal on a rocky reef north 

 of Tagus Cove, no. 34-160, 13 Jan. 1934. Ibid., frequent on littoral 

 rocks near Black Beach Anchorage, I. Santa Maria, nos. 34-219, 34-260 

 (cystocarpic), no. 34-232 (proliferous), 17 Jan. 1934. Ibid., in tide 

 pools, I. Baltra, no. 34-329, 22 Jan. 1934. 



Squamariaceae 



Plants spreading, crustose; partly or nearly completely calcified; 

 structurally generally showing a basal layer of radiating filaments sup- 

 porting a compact upper layer of erect filaments ; sporangia tetrapartite, 

 in nemathecial groups or crateriform conceptacles ; spermatangia tufted 

 on paraphysal filaments ; carpogenic branches short, lateral on similar fila- 

 ments ; cystocarps small, immersed or superficial. 



KEY TO GENERA 



1. Tetrasporangia formed in crypts; thallus firm, not calcified . 



Hildenbrandia 



