1106 Eu-Floridese, Rytiphloese, Vidalia. 



plicem seriem foventia. Color algae madefactee badius, exsiccatae 

 nigrescens. Substantia frondis firma membranacea. Specimina ex- 

 siccatione chartae ne minime quidem adhaerent. 

 C. Vidalia spiralis Lamour. in Dict. cl. V, p. 387, J. Ag. Sp. II, 3, 

 p. 1120, Florid. Morphol. p. 198, t. 33, f. 26-29, Falkenb. Rhodome- 

 laceen (1901) p. 428, Delesseria spiralis Lamour. Essai t. 9, f. 2, 

 Epineuron spirale Harv. Nereis Austr. p. 2B, tab IX, Kuetz. Sp. 

 p. 848, Tab. Pbyc. XIV, t. 100, f. a-c, Dictymenia spiralis Sond. 

 Alg. Preiss. II, p. 182, Harv. Mar. Bot. of West. Austr. p. 538, 

 Rhodomela tridens var. spiralis Ag. Sp. I, p. 374, Syst. p. 197, 

 Epineuron Backhousii Harv. in Lond. Journ. IV, p. 532 in not., 

 Kuetz. Sp. p. 849 (nomen), Rhodomela serrulata Ag. Syst. p. 197 

 (partim). — Fronde lineari, hic illic spiraliter torta, a margine de- 

 composito-pinnata ciliisque subulatis incurvis frondis latitudinem 

 haud tequantibus serrata; stichidiis secus costam dense aggregatis, 

 lanceolato-oblongis, fasciculatis; cystocarpiis subglobosis, in ciliis 

 marginalibus aut prolificationibus costae evolutis. 



Hab. ad oras occidentales Novae Hollandia' (Lamouroux, Preiss, 

 Harvey), ad « Swan Riyer Colony » (Backhouse, Preiss, Mylne). 

 — Frons circiter 15-20 cm. longa, 3-4-pinnata, per totain iongi- 

 tudinem costata, costa in superiore parte parum conspicua, inferne 

 incrassata, denique in infima parte ita evoluta ut caulem teretiu- 

 sculum subspiraliter tortum, margine dentato ancipitem, crassitie 

 pennam columbinam a?quantem efhciat. Pinnas membranacea^, linea- 

 res, 2 mm. circiter latas, hic illic spiraliter tort;e, a margine pin- 

 nulis conformibus erecto-patentibus subdivisse et intermixtis ciliis 

 serrata\ Cilia vix 2 mm. distantia, alterna, subulato-acuminata 

 plus minus incurva, in una forma longiora fere latitudinem fron- 

 dis aaquantia, in altera fere duplo breviora, simplicia aut ipso apice 

 appendiculata, demum in una forma cystocarpifera. In planta fertili 

 secus costam proveniunt processus brevissimi, ciliis nempe adhuc 

 breviores, nonnunquam costam ipsam obtegentes, e cellularum cor- 

 ticalium evolutione orti (ut docet clarus Falkenberg) in fronde sub- 

 transversaliter positi, fasciculatim subdivisi, ramis sensiin in sti- 

 chidia intumescentibus. Stichidia sunt semimillimetrum vix longa, 

 complanata, incurva, lanceolato-oblonga, a facie duplicem, ab acie 

 simplicem tetrasporangiorum seriem monstrantia, tetrasporangiis in 

 singulis articulis geminis oppositis, quasi vena intermedia separatis. 

 In processibus consimilibus aut in ciliis marginalibus evoluta cy- 

 stocarpia adsunt subglobosa, costalia brevi pedicello, marginalia 



