'3i 



part arranged in two doublé rows directed towards the front and back surfaces of the frond, 

 about 25 — 40 ij. long, in upper part of frond; in lower part of frond less regular in arrange- 

 ment and size, being usually distichously secund and interrupted, about 25 — 1 20 «. long. 



Filaments of stipes bearing lateral appendages one or more times dichotomously divided 

 and with obtuse apices. [Figs. 66 — 68]. 



U. Wilsoni is an interesting addition to the genus and forms with its near ally, 

 U. verticillosa, a little group characterised by the crowded pseudo-verticillose arrangement of 

 the lateral appendages of, and by the absence of supra-dichotomial constrictions from, the main 

 filaments of the frond. The most obvious difference between the two species is that the lateral 

 appendages in U. Wilsoni are very obtuse (fig. 67), while in U. verticillosa they are acute. 



The specimens of U. Wilsoni submitted to us by Dr. Howe are all compound (fig. 66), 

 consisting not of a simple stipitate flabellum, but of a laminated mass or a congeries of 

 flabella hinged, as it were, upon an imaginary axis forming an upward prolongation of the 

 stipes. Possibly this peculiar habit may be due to the conditions under which these plants 

 were found growing. We have no data as to their environment, save that they were plentiful 

 in shallow, sandy bays (P. Wilson in Journ. New York Bot. Garden. X. 1909 p. 175). 



We are indebted to Dr. Howe for permission to describe this species, the material 

 of which was communicated to him by Mr. P. Wilson the finder, after whom it is named. 



U. Wilsoni it at present only known from the Bahamas. 



15. Udotea flabellum Howe 



in Buil. Torrey Bot. Club. XXXI. 1904. p. 94. 

 Syn. Corallina Flabellum Ellis & Solander Nat. Hist. Zoophyt. 1786. p. 124. tab. 24. 

 Corallina Flabellum Gmelin Linn. Syst. Nat. vol. I. part VI. 1790. p. 3842. 

 Corallina Pavonia Esper Fortsetzung der Pflanzenthiere. II. Theil. 1798 — 1806. tabs. 8, 9 



(no text). 

 Corallina Flabellum Bosc Hist. Nat. des Vers (Suites a Buftbn) vol. III. iSmo Paris (Déterville). 



1802. p. 71. 

 Flabellaria Pavonia Lamarck Polyp. empatés in Arm. Mus. d'Hist. Nat. torn. 20. 1813. p. 301. 

 Udotea flabellata Lamouroux Hist. Polyp. corall. flex. 1816. p. 311, tab. XII, fig. 1. 

 Flabellaria Pavonia Lamarck Hist. Nat. Animaux sans vertèbres. torn. II. 1816 p. 343. n" 2 ; 



op. cit. ed. II. tom. II. 1836. p. 527. 

 Corallina flabellum Cuvier Règne Animal IV. 18 17 p. "]~j. 

 Udotea flabel/ata Lamouroux Expos. méth. 1821. p. 27. tab. 24. 

 Udotea flabellata Deslongchamps in Encyclop. Méth. Zoophyt. 1824 — 5. p. 762. 

 Udotea flabelliformis Blainville in Dict. Nat. LVI. 1828. p. 229. 



Udotea flabellata Decaisne Mém. s. 1. Corallines etc. in Ann. Sci. Nat. vol. XVIII. 1842. p. 105. 

 Udotea Pavonia Decaisne op. cit. p. 107. 

 Flabellaria iucritstata Chauvin Recherches 1842. p. 123. 

 Udotea flabel/ata Kutzing Species Algarum 1849. p. 502. 

 Udotea Halimeda Kützing op. cit. p. 503. 



Udotea flabelliformis Duchassaing Animaux Radiaires des Antilles. Paris. 1850. p. 29. 

 Udotea flabellata Kützing Tab. Phyc. vol. VII. 1857. p. 8. tab. 20. 

 ? Udotea Halimeda Kützing loc. cit. vol. VIII. 1S5S. p. n. tab. 26, figs. II. a & b. 

 Udotea flabellata Harvey Nereis Bor. Amer. vol. III. 185S. p. 26. 



