1 1 



SIPHONEAE. 



Halimeda Lamouroux. 



Synopsis of species of Halimeda. 



A. Central filaments do not fuse, but communicate directly with one another by means of large 

 open pits. (Sometimes in small plants of H. incrassata the pits are few or wanting). Filaments 

 at apex of node hang together under treatment. 



1. Joints flat, broad, oval or rounded in outline 6. H. macroloba. 



2. Joints thickened below, often cylindrical, upper ones sometimes flattened 



and trilobed •?. H. incrassata. 



B. Central filaments fuse; usually in pairs or in threes, very rarely more, at the apex of each joint. 

 Filaments separate easily under treatment, except H. cuneata. 



a. Filaments fuse in pairs. Joints ribbed, much calcified. 



1. Fusion incomplete, limited to the surface of contact of lateral walls. 4. H. Opuntia. 



2. Fusion complete. Fused portion branches later trichotomously in the 



next joint 5. JJ. gracilis. 



b. Filaments fuse in twos or threes, very rarely more, branching di-or trichotomously in the 

 next joint. Joints not ribbed, slightly calcified, flat; discoid or cuneate. 



1. Lateral walls of adjacent peripheral cells in contact for a quarter to half 



their length. Filaments hang together at apex of joint under treatment. 2. H. cuneata. 



2. Lateral walls of adjacent peripheral cells in contact for a very small 



fraction of their length C/25 to Vin)- • • • \. H. Tuna. 



3. Lateral walls of peripheral cells entirely free ; the cells very large 



in surface view, (about 150 (& in diameter) 3. H.macrophysa. 



1. Halimeda Tuna Lam. 



"Sur la Classif. d. Polyp. corall." etc. in Soc. Phil. N. Buil. Paris III. 1812. p. 186. 



Sertolara Imperato, Hist. Nat. 1599. p. 748. 



Lichen marinus Clusius, Rar. Plant. Hist. Lib. VI. 1601. p. CCL. 



Corallina latifolia and Opuntia marina Cortusi, ex Clusius 1. c. 



Fucus folio rotundo Bauhin, Pinax. 1623. p. 364. 



Lichen marinus rotundifolius Gerard, emac. 1633. p. 1567. (The block used by Clusius came 



into the possession of Johnson, who used it in this work). 

 Opuntia marina Parkinson, Theatr. Bot. fol. 12 1640. p. 1294. Ray y/- 5- 

 Scutellaria sive Opuntia manna Bauhin, Hist. Plant. lib. XXXIX 1651. p. 802. (This author 



gives an excellent figure of H. Tuna. 

 Sertularia, Opuntia marina Chabraeus, Stirp. 1666. p. 572. 

 Sea Baud-strings Petiveriana Naturae Collectanea I. 17 16. 

 Opuntia marina ou Sertolare Imperato, Marsilli Hist. Phys. de la Mer 1725. p. 65. pi. 7. 



fig. 31. pi. 8. fig. 32. 

 Sertularia ramosissima, articulis reniformibus compresso-planis trichotomis Linn. Hort. Clift*. 



1 737- P- 4^°- m part. 

 Sertularia etc. Royen, Flor. Lugd. 1740. p. 523. 

 Corallina Opuntia Linn. Syst. Nat. vol. I. 1760. p. 805 in part et Ed. 12. 176Ó. p. 1304 



in part. 

 Corallina Opuntia Pallas, Elench. Zoophyt. 1766. p. 420 (excluding synon. in part). 

 Corallina Tuna Ellis et Solander, Nat. Hist. Zooph. 1786. p. III. Tab. 20. fig. e. 

 Corallina discoidea Esper, Pflanzenthiere Th. II. Corallina. 1798 — 1806. Tab. XI. 



