322 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



at the point of each segment, the primary cell row with intercalary divi- 

 sions; margins minutely denticulate; antheridial sori single or in pairs 

 in apical portions of pinnae, superficial; cystocarps and tetraspores un- 

 known. 



D. 194, lower littoral on the reef, Puerto Refugio, Jan. 27, 1940. 



This species resembles Erythroglossum minimum Okam., but is 

 larger, has a midrib, and has more regular, more sharply acute pinnae. 

 Rhizoids from the fronds do not develop as in E. minimum. 



Genus GRINNELLIA Harvey 



Grinnellia lanceolata sp. nov. 



Plate 47, Fig. 6 



Frondes usque ad 2.5 cm. altae, laminis brevi stipitatis, lanceolatis adhesione 

 spongiose compositae; laminis costa delicata excepta monostromaticis, integribus, 

 nerviis lateralibus nullis, marginibus integribus, tantura undulatis, cellula apicali 

 indutis; ordinis cellularum primariae divisionibus nullis; soris tetrasporangiiferis 

 supra frondem sparsa 5-15 tetrasporas tripartitas producentibus. 



Plants to 2.5 cm. high, of several short-stipitate, lanceolate blades 

 from a spongy holdfast ; blades monostromatic except at the delicate mid- 

 rib, undivided, without side nerves, with entire, only slightly undulate 

 margins; frond-apices blunt, with an apical cell; primary cell row of 

 midrib without intercalary divisions; tetrasporic sori scattered over the 

 frond on either side of midrib zone, producing 5-15 tripartite tetraspores; 

 cystocarps scattered over frond (no cystocarpic leaflets on type), hemi- 

 spherical, with a small ostiole lacking rostrum. 



Type: D. 626, dredged in 34-50 meters, off Gorda Point, Feb. 15, 

 1940. Herb. AHF no. 57. 



The small size and narrow lanceolate fronds almost without margi- 

 nal undulations serve to distinguish this species from the large Atlantic 

 plant, Grinnellia americana, with which it seems most closely related. 



Genus POLYNEURELLA gen. nov. 



Frondes laminis latis, membranaceis inferne petiolatis semiteretibus, e disco 

 simplici orientibus compositae; laminis ovatis, juvenis monostromaticis, cellula 

 apicali crescentibus, costa nulla, venis microscopicis multis longitudinalibusque; 

 tetrasporangiis tripartitis in soris rotundis parvisque, pustulatis e superficiebus 

 ambis frondium orientibus, regulariter sparsis. 



Plants composed of broad, rose-colored, membranous blades and 

 branched, semiterete, petiolate parts arising from a simple discoid hold- 

 fast ; blades ovate, monostromatic in younger parts, growing by means of 



