NO. 8 DAWSON : A REVIEW OF THE GENUS RHODYMENIA 139 



(29) RHODYMENIA AUSTRALIS (Sond.) Harv., Phyc. Aus- 

 tral, (1860), tab. 146; J. Ag., Epicr., p. 332; Rhodymenia aus- 

 tralis Sond., in Botan. Zeitung. (1845 ) , p. 56 ; Acropeltis australis 

 J. Ag., Sp. II, p. 609; Kuetz., Tab. Phyc, vol. XIX, t. 34, figs. 



c-e. 



Plate 18, Figs. 7-8 



Distribution. — Southern East Indies; Australia; New Zealand. 



(30) RHODYMENIA SCHMITTII Taylor, Mar. Alg. from 

 Southeast. South America (1939), p. 148, pi. II, fig. 2. 



Distribution. — The type from Port Stanley, Falkland Islands. 



(31 ) RHODYMENIA ATTENUATA sp. nov. 



Plate 19, Figs. 10-11; Plate 25, Fig. 35 

 Frons brevi-stipitata, super basem stolonifera superne (1 cm. super discum) 

 expansa; segmentis divaricatis, laminam linearem exteriorem rotundatam prae- 

 bentibus, angustis, 1.5-2.5 mm. latis, ultimis frequenter longioribus, in plantis 

 sterilibus ad apices acutos attenuatis, in plantis tetrasporangiiferis iterum ad apices 

 latiores expansis ; soris tetrasporangiiferis rotundatis, parvis in partibus apicalibus 

 aut in proHficationibus eorum parvis, in nematheciis; plantis cystocarpiiferis 

 conspicuore stipitatis stoloniferentibusque usque ad 1-1.5 cm. super basem, stipites 

 secundarias laminarum expansarum praebentibus ; cystocarpiis in segmentis ter- 

 minalibus aut in proliferationibus angustis eorum, laxe sparsis, vulgo urceolatis. 



Fronds short-stipitate, with stolons branching from above base, ex- 

 panding usually about 1 cm. above holdfast; segments spreading, giving 

 the plant a rounded outline, narrow, 1.5-2.5 mm. broad, the ultimate 

 ones often longer, attenuated to acute apices in sterile plants, in tetra- 

 sporic plants again expanded to broader apices ; tetraspores in small 

 rounded sori in the expanded apices of the ultimate segments or on small 

 proliferations from these, causing a nemathecioid modification of the 

 cortex; cystocarpic plants more conspicuously stipitate, with stoloniferous 

 branches 1-1 ^ cm. above the base, providing secondary stipes for the 

 expanded blades ; cystocarps borne on the terminal segments or on narrow 

 proliferations from these, rather sparse, mostly urn shaped. 



Tetrasporic Type. — On rocks in sheltered places in the lower littoral 

 zone. Whites Point, west of San Pedro, Calif., Dec. 23, 1912, N. L. 

 Gardner 2534; Herb. Univ. Calif. 276284. 



Cystocarpic Type. — Cast ashore. Pebble Beach, Carmel Bay, Calif., 

 Jan., 1917, N. L. Gardner 3611 ; Herb. Univ. Calif. 372081. 



Sterile Type.— San Pedro, Calif., Oct. 21, 1896, A. J. McClatchie 

 1264; Herb. Univ. Calif. 96226. 



