Eu-FJoridese, ITerposiphoniese, Herposiplionia. 1051 



p. 158, Engl. & Prantl Natiirl. Pflanzenfam. (1897) p. 459, Fal- 

 kenb. Rhodomelaceen (1901) p. 302, Polysiphonia subg. Ptilosi- 

 phonia sect. pectinatw J. Ag. Sp. II, 3, p. 909, Hutchinsioz, Ce- 

 ramii, Grammitce, Dasyce, Polysiphonice sp. auct. — Frons re- 

 pens et radicibus apice scutatim dilatatis adfixa, ecortieata, e sur- 

 culis horizontalibus adscendons aut rarius omnino erecta exsur- 

 gens, lateraliter ramosa, teres aut complanata aut ancipiti-com- 

 pressa. Segmenta et longiora et breviora eximie distincta; longiora 

 dorsiventrali structura donata, apice involuta, lateribus distiche al- 

 ternatim ramos elongatos ad geniculum quodquc quartum emittentia; 

 breviora uui-biseriatim e dorsuali regione longiorum segmentorum 

 exeuntia, srepe mox definita, structuram ralialem aut dorsiven- 

 tralem praebentia, apice penicillata, penicillis deciduis. Siphones pe- 

 ricentralos plerumque numerosi, more 12-18, diu nudi. Fructus in 

 ramulis h. e. segmentis brevioribus obvenientia. Tetrasporangia in 

 regione media ramulorum evoluta, secus seriem singulam plus mi- 

 nus irregulariter interruptam aut rectam disposita. Cystocarpia 

 ovata vel globosa, carposporis acrogenis clavatis. Antheridia in 

 apice rainulorum sita, oblonga, pedicello monosiphonio fulta. 



1. Herposiphonia tenella (Ag.) Naeg. Polys. und Herpos. (1840) t. VIII, 1715 

 i". 2, Ambronn in Bot. Zeit. 1880, p. 13, t. IV, f. 9, 13-17, Schmitz 

 Syst. Uebers. Florid. (1889) p. 15, Falkenb. in Engl. & Prantl 

 Natiirl. Pflanzenfam. (1897) pag. 459, fig. 258 A, Rhodoinelaceen 

 (1901) png. 304, t. 3, f. 13-17, Polysiphonia tenella J. Ag. Alg. 

 Med. p. 123, Sp. II, 3, p. 919, Kuetz. Sp. p. 805, Tab. Phyc. XIII, 

 t. 30, f. cl-e (?), Ardiss. Pbyc. Medit. I, p. 367, Hauck Meeresalgen 

 p. 239 'non Erb. critt. it , nec De Notaris), Hntchinsia tenella Ag. 

 Sp. II, p. 105, Polysiphonia tennissima De Not. Prosp. Fl. Lig. 

 pag. 07 (sec. Dufour.). — Fronde arachnoidea, nana, filis decum- 

 bentibus radicantibus decomposito-ramosis ramulisque brevioribus 

 pectinatis, apice parum incurvatis, ramulis verticalibus bifariis se- 

 cundatis gracilibus curvatis acutiusculis, articulis 8-10-siphoniis, 

 priinariis diametro sesqui-duplo longioribus, ranmloruni supremis 

 aaqualibus; tetrasporangiis in ramulis intumescentibus seriem haud 

 interruptam more efficientibus. 



Hab. in frondibus Algarum in sinu Neapolitano I.erthold, 

 Ealkenberg); in mari Tyrrheno ad insulam Caprariam (Moris et 

 De Notarts : in mari Adriatico (Biasoletto, Zanardini, Hauck). 

 — Coespes vix 2,5 cm. altus. Fila primaria decumbentia et deor- 



