36 CARL SKOTTSBERG, MARINE ALGJE 2. RHODOPHYCE^E. 



in vain to extract from Agardh's lengthy discussion any features distinguishing Schizo- 

 neura from other genera. His so-called twin sori, i e. that tetrasporangia are found oppo- 

 site each other on both surfaces of the frond or leaflet, is nothing peculiar to Schizoneura 

 but was observed in other genera as well. Agardh was aware that his genus included 

 two types of anatomical structure. I have little experience of some of his species, but 

 as far as I can judge, S. subcostata and Davisii belong to Nitophyllum; the affinities of 

 S. Hookeri and laurifolia are unknown, but they are hardly congeneric. Finally, S. 

 quercifolia is, in all essential characters, a true Phycodrys. It differs from the type of the 

 genus, Ph. sinuosa Kutz. Sp. Alg. p. 784, in the tetraspores forming numerous sori on 

 the main frond, but I shall not venture to separate it from Phycodrys for this reason only. 

 It is nearly related to Ph. Setchellii Skottsb. from California and has been confounded 

 with this. Figures of both species were published in my paper on the latter. 



Distribution: Chiloé (acc. to Gay); W. Patag., San Rafael Bay (acc. to De Toni 

 and Forti); Fuegia; Falkl.; Kerg. (acc. to Askenasy). 



Ph. austrogeorgica no v. spec. — Fig. 15. 



Fröns lanceolata, membranacea, permanifeste costata et penninervia, margine re- 

 gulariter denticulata, parce inciso-lobata, ad 20 cm älta et 1 cm lata, adulta e stipite 

 et costa pinnigera, pinnis numerosissimis acutis, majoribus et minoribus commixtis. 

 Cystocarpia in foliis 1 — 5 cm longis per frondem inter nervös sparsa, pusilla, hemisphae- 

 rica, structuram generis praebentia. Sori in phyllis subteretibus angustis acutis, 1 — 2 

 mm solum longis, secus costam pullulantibus, vel in dentibus marginalibus incrassatis 

 evoluti. Tetrasporangia utroque latere stratum efficientia, cellulis sterilibus arcte 

 cincta, triangule divisa. Crescentia apicis pro genere typica. Lamina monostromatica, 

 costa nervique incrassati, medulla cellulis majoribus, cortice valde polystromatico cellu- 

 lis pulchre radiatis minoribus, structura igitur pro genere omnino typica. Planta mascula 

 non inventa. 



South Georgia: Bay of Isles, Rosita Harbour, sublit. circ. 8 m, rocks aud 

 stones (St. 52, 25. 4. 09, ©). Also in the collection of the German Expedition 1882 — 83: 

 1) »South Georgia» 2) »Pinguin Bay, nördl. Strand der Landzunge», 3. 7 1883, $. 



Not like any other species that I know of and differing from the typical species in 

 the copious proliferations, not only from the margin of the old denudate costa, but also 

 from the midrib of the lamina (fig. 15 a). The lobes of the frond sometimes grow out to 

 form segments as in Ph. si?iuosa or quercifolia. The sporophylls are very like the mar- 

 ginal ciliae in sinuosa, but are as a rule seated on the midrib, while sometimes marginal 

 teeth bear tetrasporangia, both kinds occuring on the same leaflet as seen in fig. 15 b. 

 Thus I find strong reasons to refer the new species to Phycodrys, with which it agrees 

 in apical growth (fig. 15 c) and structure of the costa (fig. 15 d — f ). 



Distribution: S. Georgia. 



Cladodonta nov. nom. 



Syn. Glossopteris J. Ag. Sp. Alg. Ill: 3 p. 194 (1898) non Brongn. 1828 (genus 

 fossile). 



