692 
IX. A LG.®. 
70. RHODYMENIA, Greville. 
Frond flat, dull or rose-red or purplish, ribless, membranous, dichotomous, 
palmate or flabellate ; structure of 2 strata of cells ; medullary large, oblong, 
polygonal ; cortical minute, in vertical lines, coloured. Conceptacles scattered 
over the frond or in sori near the tips of the segments, sessile, hemispherical, 
thick walled, opening by a pore, enclosing a dense tuft of sporiferous fila- 
ments in gelatine. Tetraspores cruciate or 3-partite, scattered or in sori. 
A large genus in both temperate zones. 
§ 1. Tetraspores scattered over the surface of the frond. 
1. R. sanguinea, Harv. in FI. N. Z. ii. 248. Frond 12-14 in. long, 
purplish blood-red, firmly membranous, with a cylindric stipes and cuneate 
base, deeply laciniate ; segments broad or narrow, cuneate, attenuated ; margins 
simple or foliiferous ; leaflets cuneate ; axils rounded. Conceptacles very 
numerous, scattered densely over the whole frond. Tetraspores abundant on 
the smaller segments. 
Foveaux Straits, Lyall. 
2. R. lanceolata, Harv. in FI. N. Z. ii. 248. Segments of the frond 
6-8 in. long, quite simple, narrow, i in. broad, tapering to the base and 
acute apex, purple red ; fruit as in It. sanguinea. 
Port Cooper, Lyall ; Otago, Lindsay. — Perhaps only a variety of R. sanguinea , with 
simple longer segments, but the substance is softer, and the cortical layer more developed. 
3. R. prolifera, Harv. in FI. N. Z. ii. 249. Frond dull red-brown, 
4-8 in. long, cuneate at the base, with a short stipes ; axils rounded ; seg- 
ments spreading, |-1 in. wide, linear or subcuneate, sparingly divided, pro- 
liferous at the apex ; leaflets often stipitate, linear, acute or attenuate at the 
base, simple or forked. Sori indefinite, remote from the attenuated tips of 
the segments. 
Hawke’s Bay, Colenso. — Similar to It. linearis , but larger, thicker, generally proliferous, 
and with differently placed tetraspores. 
4. R. ornata, Mont.; — FI. Antarct. 186. Frond bright purple, sub- 
carnose, oblong lanceolate, very broad, proliferous on the margins ; segments 
or leaflets obovate, substipitate, very large, palmately lobed. Conceptacles 
scattered over the whole frond. — Mont. Voy. au Pole Sud, 149. t. 11. 
Lord Auckland’s group, D' Urville . — Unknown to us ? Consistence of Iridcea edulis 
(Mont.) 
§ 2. Tetraspores collected in sori towards the tips of the segments. 
5. R. linearis, J. Ag. ; — FI. N. Z. ii. 248. Frond elongate, 4 in. long, 
decompound ; segments narrow, flabellate, altogether linear, ' n - broad, 
terminal obtuse or emarginate ; axils subacute. Conceptacles apiculate, 
never marginal, scattered over the disk of the frond. Tetraspores below the 
tips of the segments. — J. Ag. Sp. Alg. ii. 379. R. Palmetta, Hook. f. and 
Harv. in Loud. Journ. Bot. vii. 444, not of Greville. 
