100 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



cortical cells 20-25 fi wide, 1-3 times as long as broad, half as long or 

 equal to the subcortical cells ; lower cortical cells of the same width as the 

 upper; sexual phase dioecious, the antheridial sori more or less scattered; 

 oogonial ( ?) sori 0.25 mm wide, in a single or paired continuous or 

 broken band between the hair lines. 



Mexico: Nayarit, dredged from 5.5-9.0 meters' depth at sta. 971 off 

 I. Maria Magdalena, Las Tres Marias, no. 39-669 (TYPE), 9 May 

 1939. 



Padina crispata Thivy n. sp."-'' 



Plants 2-4 cm tall, 2-6 cm broad, flabelliform, with a distinct stipe 

 and holdfast, the basal third bifacially stupose, the blades above split to 

 lobes 1-4 cm wide, calcified on the lower surface, with piliferous lines 

 0.75-3.00 mm apart opposed or only on the upper surface; thickness of 2 

 cell layers above, increasing to 6-8 layers in the lower part and 130-200 p.] 

 cells of all layers 20-40 /x wide ; in upper part the upper cortical cells 25- 

 65 /i, long and the lower 45-75 /a long, but in the lower part of the blade 

 the length on both surfaces 25-50 /a ; tetrasporangial sori on either surface 

 or both, in consecutive interpilary zones and forming one or two rows or 

 scattered, with a delicate indusium, the sporangia 75-100 /* diam. ; 

 oogonial sori linear or round, 0.25 mm diam., indusiate, the oogonia 35- 

 50 jn diam. 



'''2b Padina crispata Thivy n. sp.(ex manuscripto inedit.) — Plantae 2-4 cm altae, 

 2-6 cm latae, flabelliformes, distincte stipitatae et bysso praeditae; lobis valde cris- 

 patis, 1-4 cm latis, inferne calce incrustatis, utrinque in tertia parte inferiore stu- 

 posis; zpnis concentricis 0.75-3.00 mm latis, interdum indistinctis vel delineatis a 

 lineis piliferis oppositis vel a lineis solis superioribus; fronde in apicali parte 

 (usque ad regionem 5 mm infra marginera revolutam) 2-stratosa, 30-40 \i crassa, in 

 regione media 4-6-stratosa, 65-130 (x crassa, et supra stipitem 6-8-stratosa, 130-200 \i 

 crassa; cellulis stratorum omnium 20-40 [i. diam., in sectione transversali oppositis, 

 solis exceptis eis superioribus corticalibus in regione basali radialiter divisis; cellu- 

 lis corticalibus in regione basali radialiter divisis; cellulis corticalibus inferioribus 

 eo modo non septantibus sed latitudine paululo compressis; cellulis corticis superi- 

 oris exacte infra partem revolutam 25-65 \x. longis, iis corticis inferioris 45-75 [i 

 longis, ambabus in regione frondis basali 25-50 pi longis; in sectione radiali cellu- 

 lis corticis superioris cellulas subcorticales aequantibus vel dupio brevioribus; 

 cellulis inferioris corticis eis superioris consimilibus in regione basali sed sursum 

 subcorticales aequantibus; soris tetrasporangialibus zonas consecutivas superne vel 

 subtus vel utrinque occupantibus, 1- vel 2-seriatis vel plus minusve dispersis, 0.5 

 mm lads, indusio tenuissimo praeditis; tetrasporangiis maturis 75-100 \i diam., 

 altitudine diametrum aequantibus vel sesquipliciter altioribus quara diametro; 

 cellulis basalibus ca. 12 \i diam., ca. 40-60 ]i longis; soris oogonialibus linearibus 

 vel circularibus vel forma intermediis, 0.25 mm diam., indusiatis; oogoniis 35-50 \l 



oA^i^-^^'^"*^ *>'P^^^ ^" ^°^° '^icto Golfo Dulce, Costa Rica, legit W. R. Taylor no. 

 39-100. 26 Mar. 1939. 



