62 COLLINS AND HEEVET. 



Var. secunda (Harv.) comb, nov.; B. plumosa var. secunda Harvey, 

 1858, p. 31, PL XLV. A, figs. 1-3; B. Harveyana Collins, 1909, p. 405._ 

 This variety shows a certain dorsiventral arrangement, the ramuli 

 on both edges of the rachis curving towards each other on one side. 



Var. Leprieurii (Kiitz.) comb, nov.; B. Leprieurii Kiitzing, 1849, 

 p. 490; 1856, p. 27, PI. LXXV, fig. 2; Collins, 1909, p. 404. In this 

 variety the ramuli are in short secimd series, separated by short vacant 

 spaces. 



Fa-ahlt DERBESIACEAE. 

 Deebesla. Solier. 



1. Filaments 100-600 M diam. 3. D. Lamourouxii. 



1. Filaments less than 100 M diam. 2. 



2. Filaments 40-50 m diam., dichotomously branched. 



1. D. vaucheriaeformis. 

 2. Filaments 50-70 /i diam., simple or with short lateral branches. 



2. D. marina. 



1. D. VAUCHERLiEFOEMis (Harv.) J. G. Agardh, 1886, p. 34; 

 Collins, 1909, p. 406; D. tenuissima Farlow, 1881, p. 60, PI. IV, fig. 4; 

 Chlorodesmis vaucheriaeformis Harvey, 1858, p. 30, PL XL. D. On 

 Dictyopteris Justii, Gravelly Bay, Aug., CoUins. With sporangia. 



2. D. MAEiNA (Lj-ng.) KjeUm'an, 1883, p. 16; CoUins, 1909, p. 407; 

 Vaucheria marina Lyngbye, 1819, p. 79, PL XXII. On Acantho- 

 phora spidfera, Hungry Bay, May, Collins. With sporangia. 



3. D. Lamourouxii (J. Ag.) Solier, 1847, p. 162, PI. IX, figs. 18- 

 30; Collins, 1909, p. 407; P. B.-A., No. 2168; Bryopsis BalMsiana var. 

 Lamourouxii J. G. Agardh, 1842, p. 18. Castle Harbor, near landing 

 at Tucker's Town, March, Hervey. The fronds are much stouter than 

 in the two other species of the genus, sometimes simple, sometimes 

 with a few irregular txrfts of ramuli. Old and denuded plants of 

 Bryopsis have some resemblance to it, but always show the scars of 

 fallen ramuli. 



FAinLT CAL^LERPACEAE. 



Cauleepa Lamouroux. 



1. Stolon and fronds filiform, Tvithout distinct ramuli. 1. C. fastigiata. 



1. Stolon and fronds different in character. 2. 



2. Fronds very slender, ramuli whorled, near the summit. 3. 



2. Fronds stouter, ramuli not in distinct whorls. 4. 



