226 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



Type : D. 643, on rocks in middle littoral, entangled with Cladoph- 

 ora, EctocarpuSy Ceramium, etc., San Jose del Cabo, Feb. 16, 1940. Herb. 

 AHF no. 10. 



D. 703, on rocks in middle littoral. Turner's Island, July. 



This species is very near to Sphacelaria novae-caledoniae Sauv. ( 1914, 

 p. 141, fig. 34) in morphology, but is not known to be parasitic or epi- 

 phytic as is that species. It is considerably larger, with filaments mostly 

 40-50 [I in diameter, none as slender as 20 fx. The propagula are, however, 

 very similar. Sauvageau does not mention the presence of hairs in S. 

 novae-caledoniae. 



Family Gutleriaceae 



Genus CUTLERIA GreviUe 



Gutleria Hancockii sp. nov. 

 Plate 54, Fig. 1 



Frondes diraorphae; gametophyticae 4-6 cm. altae, 100-140 n crassae, laminis 

 complanatis, membranaceis, flabellatis, 3-6 cm. latis, marginibus trichothallico 

 crescentibus ; sporoph3^icae crustosae, per rhizinas pluricellulares ramosas laxe 

 affixae, usque ad 2 cm. diara., multilobatae, marginibus integris, in superficie 

 supera 20-30 \i revolutis; divisione cellulari marginali crescentes. 



Gametophytic plants 4-6 cm. high, with flat, membranous, flabellate 

 blades with broadly rounded margins, prostrate at first and attached by 

 numerous rhizoidal outgrowths from the under side, soon erect ; flabella 

 3-6 cm. broad, with marginal trichothallic growth, somewhat laciniate in 



outer, submarginal parts, 100-140 jx thick, of large, thin-walled, -| 



rectangular, colorless, medullary cells 100-125 /a in greatest length, bor- 

 dered on either side by a single cortical layer of veiy small, brick-shaped 

 cells rich in chromatophores, 5 by 12 /* in cross section, nearly quadrate in 

 surface view but with rounded corners; gametangia unknown; sporo- 

 phytic thallus thin, crustose, light brown, loosely attached by branched, 

 pluricellular, nonmoniliform rhizoids to articulated corallines and other 

 semiloose substrata, spreading to 2 cm., multilobed ; lobes 2-5 mm. broad, 

 rounded; margins entire, turned back 20-30 /a on upper surface; growth 

 by marginal cell division; surface cells quadrate, 6-8 /x, in dimension; 

 growing together with gametophytic plants in January. 



Type: (gametophyte) D. Ill, lower littoral on rocky reef, Tur- 

 ner's Island off Tiburon Island, Jan. 24, 1940. Herb. AHF no. 11a. 



Type: (sporophyte) D. 164, lower littoral on rock-shingle beach, 

 southwest shore of Tiburon Island opposite Turner's Island, Jan. 25, 

 1940. Herb. AHF no. lib. 



