90 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



elongatis, processibus organa affixionis secondaria arenae conchaeque affixa 

 efficientibus; tetrasporangia duobus modis nata; in soris parv r is rotundatis 

 250-400 n diam., inter venas, atque in proliferationibus subteretibus stichidio- 

 formibus, e marginibus laminae orientibus; reproductio sexualis non visa. 



Thalli small, about 2-3 (5) cm. tall, consisting of 1-3 essentially 

 simple blades from a short, compound stipe (2-3 (10) mm.) attached by 

 a small, fleshy disc; blades oblanceolate to linear-oblanceolate, cun- 

 eate to the base, simple or with an occasional marginal bladelet, expan- 

 ding to 5-7 mm. wide, membranous, with a prominent, relatively coarse 

 (350-750 fi) midrib and opposite veins; margins denticulate, some of 

 the teeth often very soon elongating to form branched, terete, rhizoid- 

 bearing processes to 3 mm. long or more, forming secondary attach- 

 ments to sand and shell; tetrasporangia borne in two ways: in small 

 rounded sori 250-440 [x in diam. between the veins, and also in subterete, 

 stichidium-like proliferations from the blade margins; sexual repro- 

 duction not seen. 



Type: Holotype is E. Y. Dawson 5519, Oct. 31, 1948, in Herb. A. 

 Hancock Foundation. 



Type locality: Dredged in 60 m., 1 mi. e. of White Cove, Santa 

 Catalina Island, Calif., on brachiopod bottom. 



Additional material: Dawson 8456, Melpomene Cove, Isla 

 Guadalupe, dredged in 90 m., coarse sand, Dec. 19, 1949. 



These two collections show the distinctive characters of this species 

 quite well: small size, mostly simple, elongate blades with prominent 

 rhizoidal development of part of the marginal teeth, and dimorphic tet- 

 rasporangial sori. The rhizoidal processes are much like those of P. 

 lucasana, although more extensive, but in other features the plants are 

 dissimilar. 



Phycodrys radicosa (Okamura) Yamada & Inagaki, in Yamada 

 1933, p. 283, is similar in many respects, but that plant was originally 

 described as consisting of "2 layers of cells; the inner, of oblongo-angu- 

 lar, larger, colorless, empty cells with thickish walls; the cortical, of 

 angular, flattish cellules." This character should be verified, for it 

 would remove the plant from Phycodrys. 



Phycodrys simplex sp. nov. 



PI. 38, fig. 2-3 

 Thalli 4-5 cm. alt., e aliquot laminis simplicibus, stipitem brevem (3-5 (10) 

 mm., habentibus, e stipite communi tereti 5-10 mm. long, ramosis, constantes: 

 laminae lanceolatae, sine ramis lobisve, invenales anguste cuneatae ad basim, 

 adultae latiores 1-2.5 cm. lat., costam manifestam, ad basim ad 1 mm. lat., nec- 

 non venas oppositas tenues inconspicuas habentes; margines leves, paululum 

 undulati; reproductio non visa. 



Thalli 4-5 cm. high, consisting of several short-stipitate (3-5 (10) 

 mm.) simple blades branching from a terete common stipe 5-10 mm. 

 long; blades lanceolate, without branches or lobes, basally narrowly 



