57-! EHODOMELACEAE. 



9. MURRAYELLA Sehmitz, Ber. Deuts. Bot. Ges. 11: 227. 1893. 

 1. Murrayella periclados (Ag.) Sehmitz, loe. cit. 



Hutchinsia periclados Ag. Sp. Alg. 2: 101. 1828. 

 Polysiplionia periclados Kiitz. Sp. Alg. 822. 1849. 

 Bostrycliia Tuomeyi Harv. Ner. Bor.-Am. 2: 58. pi. 14E. 1853. 

 Bostrychia periclados J. Ag. Sp. Alg. 2: 860. 1863. 

 . Polysiphonia Binderi Sond. ; Kiitz. Tab. Phyc. 14: 16. pi. 45. f. a, b. 1864. 



In rock caverns, on the roots of Rhizophora, etc., between the tide-lines and In 

 shallow water, New Providence and Bimini : Bermuda and Florida to northern 

 South America. Type from St. Croix. 



10. AMPHIBIA Stackh. Mem. Soe. Imp. Nat. Moscou 2: 58, 89. 1809. 



SCORPIURA Stackh. Ner. Brit, ix, xi. 1816 [ed. 2 not seen]. 



BOSTRYCHIA Mont, in Sagra, Hist. Cuba, PI. Cell. 39. 1838. Not Bostrychia 



Fr. Sv. Vet. Akad. Handl. 1818: 119. 1818. 



HELICOTHAMNIOX Kiitz. Linnaea 17: 105. 1843; Phyc. Gen. 433. 1843. 

 STICTOSIPHOXIA Harv. in Hook. f. II. Antarct. 483. 1847. 



Fronds stout and rigid, having commonly a spread of 2.5-5 cm. ; sections of main 

 axes showing 37 series of pericentral cells ; monosiphonous 



apices usually short or more commonly wanting. 1. A. Montar/nei. 



Fronds smaller ; sections of main axes showing 1-3 series of 



pericentral cells. 



Branchlets bearing numerous long deflexed and incurved often 

 branched monosiphonous ramelli 20-50 cells long, these cells 

 26-55 u long, longer than broad ; plants repent or prostrate, 

 forming thin mats ; sections of main axes showing 2 or 3 

 series of pericentral cells. -. A. tetiella. 



Bianchlets without monosiphonous ramelli or occasionally 

 terminating in monosiphonous prolongations 210 

 (rarely -20) cells long, these cells 15-26 W long, shorter 

 than broad at least in proximal parts ; main axes show- 

 ing 1 or 2 series of pericentral cells ; plants forming 

 dense mats. 

 Regularly bi-tri-pinnate ; ultimate branchlets, 75-200 u. 



(6-12 cells) long ; main branches prostrate 91- ascending. 3. A. Scrtularia. 

 Bi-tri-pinnate or often more or less quadrifarious through 

 the development of two rows of ventral branches near 

 the bases of the lateral branches ; ultimate branchlets 

 200-750 u. (12-40 segments or cells) long ; main branches 

 deflexed or drooping. 4. A. pectinata. 



1. Amphibia Montagnei (Harv.) Kuntze, Eev. Gen. PI. 2: 881. 1891. 



Bostrycliia Montagnei Harv. Ner. Bor.-Am. 2: 55. pi. 14B. 1853. 



On roots of Rhizopliora and rarely on other objects, usually just above the low- 

 water mark, Bimini, Great Bahama, Exuma Chain, and Watling's Island : Ber- 

 muda ; Florida ; Cuba ; and Jamaica. Type from Key West, Florida. 



2. Amphibia tenella (Vahl) Kuntze, Eev. Gen. PI. 2: 882. 1891. 



Fucus tenellus Vahl, Nat. Selsk. Skr. 5=: 45. 1802. 



Sliodomela calamistrata Mont. Ann. Sei. Nat. Bot. II. 8: 354. 1837. 



Bostrychia calamistrata Mont.; Harv. Ner. Bor.-Am. 2: 56. pi. 14C. 1853. 



Bostrycliia tenella J. Ag. Sp. Alg. 2: 869. 1863. 



Bostrychia Vieillardi Kiitz. Tab. Phye. 15: 10. pi. 26. /. a-e. 1865. 



Creeping on rocks, roots of Rhizopliora, pneumatophores of Avicennia, etc., near 

 the high-water mark, New Providence, Rose Island, Great Bahama, Gun Cay, Wat- 

 ling's Island, and Caicos Islands : Bermuda ; Florida ; and the West Indies generally ; 

 widely distributed in the warmer seas. Type from St. Croix. 



