46 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



This form differs from typical P. Lunatiae in having the erect fila- 

 ments of 5-10 cells and unbranched, with slightly lesser diameter and 

 looser arrangement than in the type. 



Panama: in a bryozoan on old shells from tide pools in the rocky 

 tidal flats at San Francisco, Panama City, no. 39-149 p.p. (TYPE), 31 

 Mar. 1939. 



PHAEOPHILA Hauck, 1876 



Plants generally epi- or endophytic, of branching uniseriate filaments 

 the cells of which bear one to three long, unseptate hairs neither separated 

 by a wall from the supporting cell nor swollen at the base; cells with 

 parietal lobed chromatophores and several pyrenoids; zoospores quadri- 

 flagellate, produced in zoosporangia which are little enlarged, but often 

 terminal on branchlets. 



KEY TO SPECIES 



1. A perforating alga in shells and corals; cells narrower, cylindri- 

 cal, often sinuous, 5-12 /* diam., 3-9 times as long up to 45 /* 

 maximum length, or subglobular up to 22 ju. diam., or with ir- 

 regular lobes and then reaching 52 ju, ; setae distinctly to slightly 

 wavy, 1.2-3.6 /x diam.; pyrenoids 1-7 per cell; sporangia 10-28 

 )Lt diam., with short emission tubes, in length not over twice the 

 diameter of the sporangium, 3.5-5.3 fx diam P. Engleri 



1. An endophytic or epiphytic alga, also found on stones; cells 

 wider, cylindrical or globular, 7-26 fx diam., 1-4 times as long as 

 wide within a maximum of 54 jx] setae distinctly wavy, 2.5-5.1 

 fx diam., pyrenoids 1-13; sporangia 33-40 fx diam., with an emis- 

 sion tube about 4 times as long as the diameter of the sporangium, 

 4.8-7.7 /i, diam P. dendroides 



Phaeophila Engleri Reinke 



Kylin 1935a, p. 193, figs. 3, 4; Thivy 1943, p. 245, pis. 1, 2. 



Mexico: Oaxaca, in dead shells from the littoral, Ba. Tangola- 

 Tangola, no. 34-563 A (det. F. Thivy), 1 Mar. 1934. Ibid., with Masti- 

 gocoleus in dead shells in the lagoon at Ba. Chacahua, no. 39-72 (det. F. 

 Thivy), 21 Mar. 1939. Is. Revilla Gigedo, in dead shells from tide 

 pools, I. Clarion, no. 39-4 (det. F. Thivy), 1 Mar. 1939. Panama: 

 Bahia de Panama, with Plyella in dead corals in pools of 3 dm depth, I. 

 Taboga, no. 39-622 (det. F. Thivy), 2 May 1939. Ecuador: Archi- 

 pielago de Colon, in dead shells from tide pools, Ba. Cartago, I. Isabela, 

 no. 34-352 J (det. F. Thivy), 25 Jan. 1934. 



