Eu-Floride(B, SquamarieeB, Peyssoiinelia. J701 



feriores diametro dii[)lo vel triplo longiores, superiores duplo bre- 

 viores. Color pallide flavescens vel rosous. A.n, ut suspicati sunt Pic- 

 conc et (Trunow, varietas Peyssonnelke atro-purpurece Crouan?. 

 12. Peyssonnelia Rosenvingii Schmitz in Uosenv. Groenl. Havalger 

 p. 782, f. 8, Collins Notes on New Mar. Algas VI (1896) pag. 5, '^^^ 

 Jonss. Mar. Alg. of Iceland I, p. 151, an Peyssonnelia halanicola 

 Fosl. New or crit. Norw. Alga; (1894) p. 1 ? (non Ha^matostagon 

 balanicola Stroemf. [1886]). — Fronde crustacea, tenui, orbiculari, 

 margine regulari vel vage undulata tota substrato arcte adnata; 

 nematheciis cystocarpiferis ambitu variis, parum elevatis. 



Hah. in Lithothamniis, conchis Balani, lapidibus ad 

 oras Groenlandia3 occidentalis (Rosenvinge) ; in L a m i n a r i i s , 

 conchis, saxis ad oras Islandiio (Jonsson); ad insulam « Specta- 

 cle Island » dictam, in Li thothamniis supra conchas aut Cru- 

 stacea crescentibus (Collins). — Frons fusco-purpurea, 1 cm. usque 

 diam. metiens. Pagina inferior calce incrustata (excepta parte mar- 

 ginali angusta), rhizinis brevissimis dense obtecta. .Etate prove- 

 ctiori crustie crassiores (usque 0,5 millim. et ultra) post exsicca- 

 tionem ssepe fatiscentes et hic illic a matrice solutae, juniores sic- 

 catEe substrato arctissime adhaerentes, plerumque magis purpurese 

 et interdum minutissime radialiter striatiB. Frons e strato decum- 

 bente monostromatico et e filis cellularum arcuatim adscendenti- 

 bus demum verticalibus contexta est. Stratum decumhens e filis 

 radialiter dispositis, hic illic subdichotomis (articulis diametro 3- 

 4-pIo longioribus) compositum. Fila adscendentia passim, proecipue 

 superne, subdichotome ramosa, apicem versus attenuata; articuli 

 in his inferiores crassi, 20-o0 \i.. lati, diametro aequales aut duplo 

 longiores, superiores sequilongi vel breviores, quam inferiores saepe 

 dimidio angustiores. Rosenvinge suspicatur ad hanc speciem per- 

 tinere posse Peyssonneliam Duhyi Dick. Alg. Sutherl. 1853, p. 142. 2665 

 13. Peyssonnelia polymorpha (Zanard.) Schmitz in Falkenb. Alg. Neap. 

 p. 264, Hauck Moeresalgen p. 35, t. I, f. 6, Mazza in Nuova No- 

 tarisia 1903, p. 98, Lithymenia polymorpha Zanard. Icon. Phyc. 

 Adriat. I, p. 127, t. 30, J. Ag. Epicr. p. 383, Nardoa polymorpha 

 Zanard. Corall. (1844) p. 37, Peyssonnelia Harveyana Crouan in 

 Ardiss. Phyc. Medit. I, p. 229, partim. — Fronde ambitu orbicu- 

 lari, lobata, laxissime amplectente radicante, multifariam involuta 

 aut polymorpha, calce indurata fragili, superficie in^quali obsolete 

 lineis concentricis notata; nematheciis sparsis, primum orbiculari- 

 bus, tandem irregulariter confluentibus. 



