190 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



occasionally the ends forked below, rarely in the upper branching; width 

 below to 0.8-1.0 mm, in the middle and upper parts to 1.0-1.5 mm, and 

 where most compressed about one fourth as thick; conceptacles not seen. 



While not so conspicuously banded as A. peruana, banding was suffi- 

 ciently apparent to be distinctive among smaller species of the area. The 

 uppermost portions of the turfs were commonly bent to one side, and 

 dwarfed specimens from exposed stations attributed to this species were 

 almost appressed to the substratum, so that this feature would have been 

 considered distinctive if better material had not been available. 



Ecuador: Archipielago de Colon, from intertidal rocks on a reef 

 north of Tagus Cove, I. Isabela, no. 34-180, 15 Jan. 1934. Ibid., com- 

 mon about Black Beach Anchorage, I. Santa Maria, no. 34-235 (TYPE), 

 17 Jan. 1934. 



Amphiroa peruana Areschoug 

 Plate 50, Figs, 1, 2 



Plants tufted, to 12 cm tall from an inconspicuous subcrustose base, 

 somewhat irregularly dichotomously branched, the tapering branches 

 erect; segments rose pink, flexible joints prominent and nearly 1.5 mm 

 long, segments in the central portion compressed, simple, subcuneate to 

 slightly bifurcate, to 6 mm long, 1-3 mm wide; uppermost segments com- 

 pressed or, in the tapering ultimate branchlets, subcylindrical, 0.8-1.0 

 mm diani,, 3-5 mm long; conceptacles numerous in the fertile segments, 

 with one pore, very slightly elevated, 0.30-0.45 mm diam. 



Areschoug, Phyc. Extraeurop. no. 41 ; Farlow 1902, p. 93. 



This is a very striking and large species, the alternating black and 

 pink bands being quite conspicuous. Materials from Areschoug's exsiccata 

 and from the collections reported upon by Farlow were available for 

 comparison. As represented in the herbarium of the University of Michi- 

 gan, the plants called J. peruana by Manza, Ecol. Surv. So. Africa nos. 

 F-21, F-21A and Papenfuss no. 93, are a smaller species more like what 

 is here called A. galapagemis, but probably not identical with it. Manza 's 

 A. ephedraea, Ecol. Surv. So. Africa nos. DC-10 and EC-1, are probably 

 different species — the latter a small thing, the former much resembling 

 the present species, though the upper branches are more attenuate. 



Ecuador: Archipielago de Colon, occasionally forming large, con- 

 spicuous colonies in the lower littoral pools near Black Beach Anchorage, 

 I. Santa Maria, no. 34-231, 17 Jan. 1934. 



