NO. 1 TAYLOR: PACIFIC MARINE ALGAE 47 



Phaeophila dendroides (Crouan) Batters 



Batters 1902, p. 13; Taylor 1928, p. 58, pi. 3, figs. 4-6 (as P. flori- 

 dearum). 



Mexico : Nayarit, with Lithothamnieae on stones, an unusual habitat 

 for this species, I. Maria Magdalena, Las Tres Marias, no. 39-670 p.p. 

 (det. F. Thivy),9May 1939. 



EGTOGHAETE (Huber) Wille 1909 



Bright green endophytes in the wall or slime of larger algae, or trano- 

 phytes in shells, consisting of creeping, free or partly fused, bilatero- 

 monopodially branched or semidichotomous filaments; cells cylindrical to 

 spherical, setigerous, uninucleate with a parietal platelike or netlike chlo- 

 roplast and one to eight pyrenoids ; seta single, straight, tubular, not sepa- 

 rated by a septum from the supporting cell ; sporangium and gametangium 

 like the vegetative cells but with an emission tube of varying shape and 

 size, containing many biflagellate zooids ; sexual reproduction isogamous ; 

 zoospores and zygotes germinating directly. 



Ectochaete perf orans Thivy, n. sp.^^'' 



Thallus perforating the hard external layers of shells, composed of 

 densely branched filaments, not united; cells uninucleate, with usually 

 one, rarely 2-3 pyrenoids, often bearing one seta, or very rarely two; 

 setae 2.0-3.8 /a diam., straight, not septate at the base but at times pro- 

 vided with a ring-shaped parietal thickening at the base, or with a sec- 

 ondary basal septum; intercalary cells 7-20 /x diam., 1.3-4.0 times as long, 

 but less than 43 /a, sometimes rhizoidal, narrow, about 3 fi diam. ; terminal 

 cells, 5-13 IX diam., 4-9 times longer than broad but between 20 and 95 /*; 

 sporangia usually intercalary, 7-28 /t diam., 17-38 /a long, containing 

 about 12 zoospores, the ostiole shaped like a small tube, 3.5-5.0 /a diam., 

 3.5-29.0 II long. 



Ecuador : Archipielago de Colon, in dead shells, abundant about Ba. 

 Cartago, I. Isabela, no. 34-352E (TYPE), 25 Jan. 1934. 



44b Ectochaete perforans Thivy n. sp. (ex manuscripto inedit.) — Thallus in 

 strata dura externa concharum perforans, e filamentis ramosis, confertis, non con- 

 junctis compositus; cellulis uninucleatis, pyrenoideis plerumque uno, raro 2-3 prae- 

 ditis, saepe unam setam (vel rarissime duas) gerentibus; setis 2.0-3.8 n crassitudine, 

 rectis, non basi septatis sed interdum aut ad basin incrassitione parietali annuli- 

 formi aut septo basali secundario instructis; cellulis intercalaribus 7-20 \i crassis, 

 1.3-4-plo longioribus, angustis, circa 3 |x crassitudine; cellulis terminalibus 5-13 

 \i crassitudine, 4-9-plo longioribus quam crassioribus sed inter 20 et 95 [x; spo- 

 rangiis plerumque intercalaribus 7-28 \i crassis, 17-38 \x longis, circa 12 zoosporas 

 includentibus, ostiolo tubuliformi 3.5-5.0 [i crasso, 3.5-29.0 |x longo. Planta typica 

 in loco dicto Ba. Cartago, I. Isabela, Archipielago de Colon, legit W. R. Taylor 

 no. 34-352e, 25 Jan. 1934. 



