598 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
Chtetophoracese, at the base of which are placed Stigeoclonium, Ctenocladus , 
Chsetonema, and Endcclonium. 
New Genera and Species of Algae.* — Prof. J. G. Agardh gives a 
monograph of the Dictyotaceae, which he divides into the following 
forms : — Zonariem ( Gymnosorus g. n., Zonaria , Homceostrichus g. n., 
Chladinophora g. n.) ; Padinese ( Microzonia g. n., Stypopodium, Lobophorci 
g. n., Taonia , Padina ) ; Spatoglossese ( Spatoglossum , , Stoechospermim, 
Halyseris ) ; and Dictyoteae ( Dictyota , Pachydictyon g. n., Dilophus , Lobo- 
spira). The new genera are for the most part formed by the subdivision 
of older genera ; 35 species of Dictyota are described, arranged in four 
sub-genera. In Taonia and Padina organs resembling zoosporanges 
were observed. 
Among Siphoneae several new species are described, and the follow- 
ing new genus, Bracebridgia : — Frons cylindracea vage decomposito- 
ramosa, ramis extimis conspicue attenuatis, elementis quasi heterogeneis 
eomposita ; axili nempe regione siphonibus cylindraceis oblongis super- 
positis, seriem unicam centralem formantibus constituta ; intermedio 
strato axiles siphones circumcirca densissime obtigente, filis confervoideis 
longius articulatis secus longitudinem excurrentibus, calcarea substantia 
invicem et cum siphonibus axilibus coalitis, contexto ; exteriore denique 
composito filis magis verticicalibus exeuntibus, brevibus articulatis, 
parce dichotomis, ramis invicem liberis ; articulis filorum interioribus 
cylindraceis, terminalibus obovatis. 
Among Pliaeosporeae we have a new genus of Ectocarpaceae, Xantho - 
siplionia, with the following diagnosis, — Frons filiformis, ex flavescente 
virescens, quoquoversum ramosa, articulata, polysiphonea, articulis 
nempe cylindraceis, in cellulas plures in orbem dispositas aeque longas 
sensim abeuntibus contexta, ramulis junioribus et supremis monosi- 
phoneis ; siliquae ex lancoideo subulatas longissimae, articulis brevissimis 
plurimis ; diametro siliquae 2-4 plo brevioribus, in partes longitudinales 
plurimas in orbem dispositas segmentatis. 
Several new species of Florideae are described, with the following 
new genus, Dasythamnion : Frons teretiuscula, jjinnatim subdistiche 
ramosa, filis funiculariter coalescentibus, stupam axilem spongiosam for- 
mantibus, ramentisque extra stupam liberis elongatis, tomentum externum 
constituentibus eomposita, quasi { heterogenea ; stupa nimirum a filo pri- 
mario axili articulato monosiphoneo, minoribusque cingentibus eomposita, 
ramentis liberis a filis extimis secus stupam excurrentibus generatis ; 
favellae in ramulis subdistichis provenientibus, coma ramentorum incur- 
vatorum obtectae, et quasi in eodem nido plures juxtapositae, intra peri- 
derma hyalinum gemmidiorum fasciculos numerosos foventes ; fasciculi 
singuli quasi filis dichotomis extrorsum fasti giatis, a centrali regione 
provenientibus, circumcirca extrorsum radiantibus constituti. 
Schizymenia.f — Prof. F. Schmitz enters into a very detailed discus- 
sion of the very complicated synonymy of the species of this genus of 
Floridese. He recognizes only two species in the Flora of the Mediter- 
lanean, S. marginata and Dubuyi. 
* Act. Univ. Lund., xxix. (1898) 144 pp. and 2 pis. Cf. this Journal, ante , 
p. 483. + La Nuova Notarisia, v. (1894) pp. 608-35. 
