NO. 1 TAYLOR: PACIFIC MARINE ALGAE 191 



Amphiroa compressa Lemoine^^^ 

 Plate 52 

 Lemoine 1929, p. 75, pi. 3, fig. 5 ; Farlow 1902, p. 93 (as A. dilatata). 

 Ecuador: Archipielago de Colon, dredged from 14-27 meters' depth 

 near the anchorage in Academy Bay, I. Santa Cruz, Schmitt no. 319A-35, 



8 Dec. 1934. Ibid., dredged from 3.5-5.5 meters' depth east of Wreck 

 Bay, I. San Cristobal, Schmitt no. 41D-33, 30 Jan. 1933. Ibid., dredged 

 from 27 meters' depth off I. San Cristobal, Schmitt (no number), 15 

 Dec. 1934. Ibid., forming fine flat rosettes which, after drying, disar- 

 ticulated at a touch, dredged from 27 meters' depth off Post Office Bay, 

 I. Santa Maria, no. 34-300, 19 Jan. 1934. Ibid., abundant at from 12- 

 18 meters' depth, no. 34-368, 27 Jan. 1934. Ibid., dredged from 22 

 meters' depth at sta. 355 off Gardner I., I. Espaiiola, Schmitt no. 355A- 

 35, 17 Dec. 1934. 



Amphiroa compressa var. tenuis n. var. ^^^ 

 PIate53, Fig. 1 



Habit somewhat more erect, the segments narrower, about 1.0-1.5 

 mm diam., generally little over 1 mm, the segments generally truncate on 

 the end, but the broadest showing the lunate incision characteristic of the 

 species, but hardly auriculate at the angles. 



Mexico: Nayarit, a narrow form rare as dredged from 24 meters at 

 sta. 970, I. Maria Magdalena, Las Tres Marias, no. 39-642B (TYPE), 



9 May 1939. Ecuador: Manabi, on the shore 1 mile south of Manta, 

 Schmitt no. 403-35, 20 Jan. 1935. 



Amphiroa Crosslandii Lemoine 



Lemoine 1929, p. 50, pi. 4, fig. 3. 



Mexico : Is. Revilla Gigedo, on coralline rocks at Braithwaite Bay, 

 L Soccoro, no. 34-30 (a small form), 3 Jan. 1934. Oaxaca, on rocks at 

 Tangola-Tangola, no. 34-555 (p. p.), 28 Feb. 1934. 



112 This species, A. Crosslandii and A. dimorpha, when collected should in- 

 variably be preserved in 50 per cent alcohol, or at least in dilute formaldehyde. In 

 fact, this is a very advantageous procedure when handling any of the articulated 

 corallines. Before mounting as dried specimens the plants must be impregnated 

 with shellac, or m.ust be pressed down into glue on a cardboard, because otherwise 

 the segments may immediately disarticulate when disturbed, and certainly will 

 not withstand the slightest pressure. Current experiments show that a solution of 

 polyvinyl alcohol with glycerine, urea, and formaldehyde gives an excellent flexible 

 coating to protect these corallines, but it is not yet known how this material will 

 stand the lapse of successive decades in herbarium storage. 



113 Amphiroa compressa v. tenuis n. v. — Plantae erectiores quam in specie, 

 segmentis calcifactis angustioribus, circa 10 mm, raro ad 1.5 mm latitudine. Planta 

 typica in loco dicto I. Maria Magdalena, Las Tres Marias, Mexico, legit W. R. 

 Taylor no. 39-642B, 9 May 1939. 



