64 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



Gelidium crinale (Turner) Lamouroux 

 Plate 4, fig. 3 



Lamouroux, in Bory, 1825, p. 191 ; Collins, 1913, p. 114; Feldmann 

 & Hamel, 1936, p. 117, figs. 5, 22; Taylor, 1937, p. 246, pi. 35, figs. 1-3, 

 pi. 40, fig. 3, pi. 41, fig. 5 ; Dawson, 1944, p. 259. Fucus crinalis Turner, 

 1819, p. 4, pi. 198. Gelidiella mexicana Dawson, 1944, p. 262, as to 

 Guaymas specimens only. 



Thalli saxicolous, 1.5-3.5 cm. high, consisting of a group of primary 

 rhizomatous branches, attached to the substratum by small discs and 

 partially penetrating parts, from which arise numerous erect branches ; 

 erect fronds more or less cylindrical below, 125-225 ju. in diameter, sub- 

 cylindrical, compressed or flattened above but little or not at all increased 

 in diameter, subsimple, unbranched or sparsely branched, or irregularly 

 pinnately branched in 1-2 orders, the branches alternate or opposite, 

 irregularly spaced and of variable length ; thallus in transection showing 

 a large number of rhizoidal filaments occupying the subcortical and 

 outer medullary area, the medulla restricted, of a small group, or single 

 or double row of thick-walled cells ; tetrasporangial sori borne in the 

 distal parts of simple, pinnate or terminally digitate branches ; antheridia 

 and cystocarps not seen in the Mexican material. 



Type: Holotype not designated but may be considered to be a 

 specimen without locality data from the Turner Herbarium, now in 

 Kew, England. It is annotated "This is Turner's idea of G. crinale and 

 may be taken as the type, f W.A.S." An isotype fragment of this speci- 

 men is on sheet 55234 in HAHF. 



Type locality: Rocks at Kilmouth, Cornwall, England. 



Mexican distribution: Pacific Baja Calif. — several collections, 

 Isla Guadalupe, Dec; Osorio-Tafall 8/21/46, Bahia Magdalena, Aug. 

 Gulf of Calif.— D. 692-40, Isla Turner, July; D. 322a-40, Bahia Gon- 

 zaga, Jan. Sinalon — D. 3612, Mazatlan, Dec. 



Of the collections listed above some of the Isla Guadalupe specimens 

 and the Bahia Gonzaga plant appear to be referable to the sparsely 

 branched ya.r. lubricus (Kiitzing) Hauck. 



A small irregularly pinnately branched plant about 1.5 cm. high 

 from Acapulco, Guerrero (D. 3875) appears to be related here to judge 

 from its habit and transection. The tetrasporangia, however, are borne in 

 blunt or slightly cordate-tipped lateral branches, and the rhizoidal fila- 

 ments are scantily developed in upper parts of the plants. This may be a 

 distinct species, possibly of Pterocladia, but it is best referred here 

 tentatively. 



