NO. 8 DAWSON : A REVIEW OF THE GENUS RHODYMENIA 149 



base or was immature in the development of the base, the stolons not yet 

 having appeared. Our specimens, in particular those of Stork and Horton 

 from Peru, show abundant stolons at the base. Since, however, such a 

 close resemblance exists between specimens of modern collections and 

 Bory's figure, we may best consider these South American plants as rep- 

 resentative of his species and redefine Rhodyrnenia corallina as a South 

 American member of the subgenus Dendryjnenia, characterizing it as de- 

 scribed above. 



Distribution. — Coasts of Peru and Chile; Southern Argentina ? (a 

 mutilated specimen). 



(45) RHODYMENIA PALMIPEDATA sp. nov. 



Plate 20, Fig. 17; Plate 24, Fig. 34 



Frons 6 cm. alta, pauca e disco simplici, per stolonium explicationem confusa; 

 stipitibus sympodialiter ramosis, inferne teretibus, superne compressis et in laminas 

 angustas expansis; segmentis laminarum inferne 1-1.5 mm. latis, iis ultimis 

 palraatis, brevissimis, acutis, palmipedes simulantibus; laminis plus rainusve 200- 

 250 \x, crassis; medullis 5-6 stratosis, cellulis magnis compositis et corticibus 2- 

 stratosis, cellulis parvis et transformationibus inter se forma magnitudinique 

 abruptis; tetrasporangiis cystocarpiisque nondum visis. 



Fronds several, to 6 cm. high, from simple holdfasts which are some- 

 what confused by the development of stoloniferous proliferations, of 

 slender, sympodially branched stipes, terete below, becoming compressed 

 above and expanding into narrow blades; segments \-\Y2 ™"^- hroad 

 below, terminating in a palmate arrangement of very short, acute ultimate 

 segments resembling the digits of a webbed foot ; blades about 200-250 \i 

 thick, of 5-6 layers of large medullaiy cells covered by 2 layers of small 

 cortical cells and with a fairly abrupt change in cell size. Tetraspores and 

 cystocarps unknown. 



T3;^^._Akaroa, New Zealand, R. M. Laing 1098, Sept., 1902; 

 Herb. Univ. Calif. 96189. 



The branched stipe together with the peculiar sharp-pointed ultimate 

 segments distinguish this species from all other South Pacific Rhody- 

 menias. 



(46) RHODYMENIA ARBORESCENS sp. nov. 



Plate 20, Fig. 19; Plate 30, Fig. 43 



Frons usque ad 12 cm. alta, e disco pauca, stolonibus deutibus; stipitibus, 

 primo semiteretibus, mox compressis, crassis, rigidis, in segmentis laminarum 

 angustis transientibus, iis 2-3 mm. latis; laminis multoplo dichotomis, cuneatis, 

 segmentis, superne gradatim angustioribus, medio plus minusve 450-500 [i crassis; 



