NO. 8 DAWSON : A REVIEW OF THE GENUS RHODYMENIA 137 



Ty/)^.— Littleton, New Zealand, R.M. Laing # 1113; Herb. Univ. 

 Calif. 96238. 



Section 4. Clinophora J. Ag. (Epicr., 331 (1876)) 



This section is maintained as founded by J. G. Agardh to embrace 

 those species having rounded tetrasporic sori located below the apices of 

 the frond-segments and having nemathecially modified cortical layers 

 (figs. 7-8). The sori may also occur in lobulate proliferations as in R. 

 lobulifera, but their position and appearance are essentially the same. 



The nemathecial condition may be less conspicuous than in Sec. Pal- 

 matae or even somewhat obscure, but wherever there is more than a sim- 

 ple displacement of the cortical cells by the developing spores, the species 

 has been assigned to this group. Where specimens are not available, the 

 arrangement and interpretation are according to J. G. Agardh. 



(23) RHODYMENIA LINEARIS J. Ag., Symb. I (1841), p. 13; 

 Sp. II, p. 379; Epicr., p. 331 ; Sphaerococcus linearis Kuetz., Tab. 

 Phyc. XVIII, tab. 91, figs, c-d (ex oras chilensibus ?) ; Kylin, 

 Die Florideenord. Rhodymen., p. 20, tab. 6. 



Distribution. — Coast of "New Holland"; Tasmania; New Zealand. 



(24) RHODYMENIA LOBULIFERA sp. nov. 



Plate 26, Fig. 36 



Frons usque ad 20 cm. alta, e disco siraplici, stolonifera; stipitibus conspicuis, 

 2-7 cm. longis, compressis, in laminis dichotomis, aliquando, primo palmatis, 

 flabellato divisis; segmentis 1.5-3.5 cm. longis, 3-5 mm. latis, vulgo leviter ad 

 apicem attenuatis; tetrasporangiis cruciatis, in lobulis parvis, lateralibus, pedi- 

 cellatis productis, nemathecioidibus (cellulis corticalibus in parte sterili sphericis, 

 in tetrasporangiifera elongatis in ordinibus anticlinis) ; C3stocarpiis in prolifera- 

 tionibus segmentorum terminaliura gracilibus, ramosis sitis. 



Fronds to 20 cm. high from a simple holdfast, with stolons; stipes 

 conspicuous, 2-7 cm. long, compressed, expanding cuneately into dichoto- 

 mous, sometimes at first palmate, flabellately divided blades; segm.ents 

 11^-3% cm. long, 3-5 mm. broad, usually slightly attenuated to apex; 

 tetraspores produced in small, lateral, pedicellate lobules, causing nema- 

 thecial modification of the cortex, the cortical cells spherical in sterile 

 material, anticlinally elongated in tetrasporic; cystocarps produced on 

 slender, branched proliferations of the terminal segments. 



