260 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



Ecuador: Archipielago de Colon, rare as dredged in 55 meters off 

 Post Office Bay, I. Santa Maria, no. 34-373, 29 Jan. 1934. Ibid., 

 dredged from a sandy bottom at 36-55 meters off an islet in Gardner Bay, 

 I. Espanola, no. 34-402 (tetrasporic, cystocarpic, TYPE), 31 Jan. 1934. 



Gallithamnion epiphyticum n. sp.^^^ 



Plants 0.5-1.0 cm tall, very flaccid, freely and repeatedly alternately 

 branched, the main axes not persistent, uncorticated, 35-45 /x diam. below, 

 the cells 2-3 times as long as broad ; minor branches divaricate ; branchlets 

 10-15 /x diam. at the base, the lower cells 3-5 diameters long, gradually 

 tapering from the base to the minutely rounded apex, the upper cells 

 4.5-8.0 ju, diam. and 35-45 fx long; tetrasporangia oval, to 35 fx diam., 50 

 II long, sessile on the upper side of the ultimate branchlets and on the 

 lesser upper branches ; spermatangia not seen ; cystocarps bilobed, on the 

 upper branches, the lobes to 35 ju, long, 28 ju, diam. 



These plants suggest C. ramosissimum Gardner (1927f, p. 404) but 

 differ in numerous details, including the absence of gland cells, smaller 

 sporangia, and notable tapering of the branchlets. 



Ecuador: Archipielago de Colon, epiphytic on the coarser algae, 

 dredged from 35-55 meters' depth off an islet in Gardner Bay, I. Es- 

 panola, no. 34-403 (tetrasporic and cystocarpic, TYPE), 31 Jan. 1934. 



GalHthamnion rupicolum Anderson, prox. 



Anderson 1894, p. 360. 



This material is very small, about 5 mm tall, and may represent 

 Collins' f. pygmaeum (Phyc. Bor.-Amer. no. 1797), but the writer's 

 material of that number is not sufficiently good to confirm the relation- 

 ship. The branching in each order seems bilateral and the branchlets, 

 unless establishing secondary axes, are simple or bear 1-3 similar alternate 

 branchlets. The tetrasporangia, one to three on the upper side of the 

 branchlets, are less numerous than they are in Gardner's material (Phyc. 

 Bor.-Amer. no. 1648) and his own collections, no. 2532, referred to the 

 species itself. 



161 Callithamnion epiphyticum n. sp. — Plantae 0.5-1.0 cm altitudine, flaccidae, 

 copiose alterneque ramosae, incorticatae, axe 35-45 [x diam., cellulis 2-3 plo diam. 

 longitudine; ramulis 10-15 \i diam., cellulis ad basim 3-5 plo diam. longitudine, 

 attenuantibus, autem, ad apicem minute rotundatum e cellulis superioribus 4.5- 

 8.0 ix diam., 35-45 ]x long, constantem; tetrasporangiis ovatis, ad 35 \i diam., 50 

 \k long., sessilibus in latere superiore ramorum ultimorum subultimorumque ; cysto- 

 carpis binis, lobis ad 35 |x long., 28 \x, diam. Planta typica in loco dicto I. Espafiola, 

 Ecuador, legit W. R. Taylor no. 34-403, 31 Jan. 1934. 



