70 A SYSTEMATIC AND STRUCTURAL ACCOUNT OF AVRATNVILLEA. 



interdum liberis, sursum in frondem flabelliformem inferne in 

 plexum rliizinarum implicatis, composiia. 



Syn. Fraddia Chauv. (' Reclierclies sur Torganisation, &c., de 

 plusieurs genres d'Algues,' Caen, 1842) ; Chhroplegma Zanard. 

 (Plant, in mari riibro, &c., Eniimeratio p. 290, tab. 13) ; Ehipilia 

 Kiitz. (Tab. Pliyc. Bd, viii. p. 12, tab. 28, 1858); Chlorodesmis 

 Bail, et Harv. (Ner. Bor. Amer. iii. p. 29, et in Wilkes, Ex]plor. 

 Exped. vol. 17 (Botany), p. 172). 



1. A. NIGRICANS Decne [loc.cit.). Sessilis vel brevistipitata, 

 fusco-nigrescens, fronde flabellata, irregulariter lobata, lobis obtusis, 

 coriacea, ex filis dicbotomis intertextis, torulosis, apicibus obtusis, 

 composita ; stipite simpliciusculo tereti crasso. 



Syn. Fradelia fuUginosa Chauv. (loc. cit. p. 124, Jide Crouan) ; 

 RMpilia Baicsoni Dickie (Journ. Linn. Soc. Bot. xiv. p. 151, pi. 11). 



Hab. In Antillis, lies des Saintes prope la Guadeloupe, 

 d' Avrainville ; Guadeloupe, Maze et Schramml (Nos. 490, 1200); 

 Barbadoes, Eaivson ! et in oris Brasiliae ad Pernanibuco, Fradel. 



2. A. LONGicAULis iiob. Flabclliformis, viridi-fusca, lacerata, 

 coacta, stipite elongato, e rliizomate subterraneo surgente, ex filis, 

 dicbotomis, intertextis, regulariter moniliformibus, apicibus obtusis, 

 composita. 



Syn. Ehipilia longicaidis Kiitz. (Tab. Phyc. Bd. viii. p. 18, 

 t. 28, fig. 2) ; Avrainvillea sordida var. longipes Crn. (in Maz^ et 

 Schramm, Algues de la Guadeloupe, p. 90). 



Hab. In Antilles, Sonder; ad ins. Guadeloupe, Maze et Schramm ! 

 (No. 1126,nonNo. 1234); St. Thomas, ' Challenger' \ Grenada,. VwTrt?/! 



8. A. soRDiDA Crn., excl. syn. (in Maz6 et Schramm, loc.cit., 

 p. 89). Flabelliformis, zonata, viridi-fusca, textura coriacea, 

 stipitata, ex filis dicbotomis, cylindricis, intertextis, liinc illinc 

 moniliformibus, apicibus obtusis, inferne viridibus sursum fusces- 

 centibus, composita. 



Hab. Ad ins. Guadeloupe, Maze et Schrajnm I (Nos. 30, 174 bis) ; 

 Grenada, Murray ! 



Directly above the bifurcation the filaments are frequently 

 moniliform for some distance. This species is distinctly inter- 

 mediate between A. longicaulis and A. Mazei. 



MM. Crouan derived the name sordida from the Vdotea sordida 

 Mont., with which they took this form to be identical. They also 

 cite Chloroj^legma sordidum Zan. Both these species are identical 

 with the Vdotea lacerata Harv., and will be found cited here under 

 Avrainvillea lacerata J. Ag. Crouan also quotes under this species 

 Ehipilia tomentosa Kiitz., which is identical with Avrainvillea hcte- 

 virens Cm., and both of these forms are to be found among our 

 species exclusae, since they obviously belong to Udotea. Moreover, 

 the Avrainvillea sordida var. longipes Crn. is, as has been seen, 

 another species, viz., our A. longicaulis. 



4. A. Mazei nob. Flabelliformis, sordide fusca, textura cori- 

 acea, stipite elongato, ex filis dicbotomis, cylindricis, intertextis, 

 fulvis, apicibus obtusis, composita ; rhizinre diametro irregulares, 

 sed haud torulosae. 



