108 COLLINS AND HEEVEY. 



plate, 1853, PI. XXIV, and the specimens distributed as Alg. Am.-Bor. 

 Exsicc, No. 12. Turner's plate of Fucus spinosm was drawn from 

 the specimen in the Linnean herbarium, and represents the type of 

 the species. It has papillae partly whorled, partly scattered; there 

 would be no trouble in matching it from Bermuda material, while 

 Harvey's plate is quite typical of the ordinary, well developed plant. 

 We think we are justified in discontinuing the name E. isiforme. 

 But on referring to the original description of Fucus spinosus, Linnaeus, 

 1771, p. 313, we find that he gives as synonym "F. denticulatus Burm. 

 prodr. 28".-'^ Referring to that page we find the description " Caule 

 compresso ramoso ramis dentato-geniculatis ramulosis subdicho- 

 tomis." This, with the reference by Linnaeus, necessitates the new 

 binomial we have used. 



We have examined specimens from the Cape of Good Hope, Singa- 

 pore and the Sunda Islands, quite indistinguishable from the American 

 plant. 



Family SPHAEROCOCCACEAE. 

 Gelidiopsis Schmitz. 



G. EiGiDA (Vahl) Weber, 1904, p. 9; P. B.-A., No. 2090; Gelidium 

 rigidum var. radicans Alg. Am.-Bor. Exsicc, No. 142; Fucus rigidus 

 Vahl, 1802, p. 46. Forms dense mats at and below low water mark, 

 generally coarse and unattractive. 



Gracilaeia Greville. 



1. Fronds stout, prostrate, attached to the substratum. 8. G. horizontalis. 

 1. Frond erect. 2. 



2. Frond plane. 3. 



2. Frond terete or compressed. 4. 



3. Frond membranaceous, dichotomous, axils wide and rounded, apices 

 obtuse. 7. G. dichotomo-flabeUata. 



3. Frond cartilaginous, axUs acute, divisions tapering, acute. 



6. G. multipartita. 



4. Branches long, filiform, slender. 1. G. confervoides. 



4. Branches not filiform. 5. 



13 There is an error in the paging of this work; the pages run 1-28, then 

 25, 26, 27, 28, and thereafter correctly; the present reference is to the second 

 p. 28. 



