144 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



(38) RHODYMENIA LEPTOPHYLLOIDES sp. nov. 



Plate 20, Fig. 18; Plate 27, Fig. 39 



Frons gregaria, 3-5 cm. alta e disco simplici, stipitibus sympodiale ramosis, 

 1-2.5 cm. longis et lamlnis parvis composita ; laminis e stipite cuneatis, semel atque 

 iterumque furcatis nonnumquam leviter flabellatis, segmentis 2-3 mm. latis, apic- 

 ibus rotundatis; stipitibus aliquando ramos deflexos in stolonibus transformantes 

 producentibus et ex iis invicem ramis laminiferentibus fortasse orientis ; segmentis 

 120-160 n crassis, medullis cellulis magnis tenuiparietalibus, 2-3 stratosis, corticibus 

 cellulis parvioribus et inter medullis et corticibus stratis cellularum magnitudinis 

 intermediarum; superficie cellulis ovatis, approxime in seriebus longitudinalibus; 

 tetrasporangiis cystocarpiisque nondum visis. 



Plants gregarious, 3-5 cm. high, from a simple, discoid holdfast ; frond 

 composed of a sympodially branched stipe, 1-2.5 cm. long, and a small 

 blade; blades cuneate from the stipe, once or twice forked, sometimes 

 slightly flabellate, the segments 2-3 mm. broad with rounded apices ; stipes 

 sometimes producing deflexed branches which form semiprostrate, stolon- 

 iferous structures from which blade-bearing branches may arise; segments 

 120-160 |x thick, composed of a medulla of 2-3 layers of large, thin-walled 

 cells and a cortical region of much smaller cells between which there is a 

 gradation in cell size; surface cells ovate, somewhat longitudinally ar- 

 ranged. Tetraspores and cystocarps unknown. 



Type. — Black Point, off Diamond Head, Oahu, Hawaiian Islands, 

 March 24, 1910, Miss Minnie Reed 1152; Herb. Univ. Calif. 622237. 



This species is very closely related to R. leptophylla, with which it 

 forms a very distinct group within the subgenus Dendrymenia. Future 

 investigations may reveal a less broken distribution of these forms, and 

 they may possibly prove identical. At present, however, since this species 

 shows a tendency toward a flabellate form of the blades while those of 

 R. leptophylla are no more than once forked, and since they are found in 

 such widely separated geographical areas, a specific distinction is probably 

 justified. 



(39) RHODYMENIA SKOTTSBERGII sp. nov. 

 Dendrymenia flabellifolia Skottsb. p.p., in Bot. Ergeb. schwed. Exped. 



nach Patagon. IX. Rhodophyceae (1923), p. 16, fig. 3 d-f, non Sphaero- 

 coccus fiabellifolius Bory. 



Plate 21, Figs. 21-23 ; Plate 27, Fig. 40 



Frons e disco simplici, 7 cm. alta, supra basem iraplicata et ramoso stolonifera; 

 laminis irregulariter dichotomo-flabellatis, nodos quosque stipitum ramosorum ter- 

 minantibus internodio quoque stipitum e lamina succedente oriente, per augmen- 



