PUCACEAE. 591 



Family 4. MESOGLOIACEAE. 



1. CASTAGNEA Derb. & Sol. Mem. Phys. Alg. 56. 1856. 



1. ?Castagnea Zosterae (Mohr) Thuret; Le Jol. Liste Mar. Alg. Cherbourg 

 85. IS 64. 



Eivularia Zosterae Mohr, in Weber, Beitr. Naturkimde 2: 367. 1810. 

 Mesogloia Zosterae Aresch. Linnaea 16: 228. pi. 8. f. la, b. 1842. 



On Thalassia, etc., Berry Islands and North Cat Cay : Bermuda to American 

 Virgin Islands ; Europe. Type from near Kiel, Germany. 



Family 5. CUTLERIACEAE. 



1. AGLAOZONIA Zanard. Saggio Class. Fie. 15, 38. [Mr] 1843. 



Padinella Aresch. Linnaea 17: 259. [My-Je] 1S43. 



1. Aglaozonia canadensis Sauv. Soc. Sei. d'Arcachon Trav. Lab. 8: 79. 1905. 

 Borg. Dansk Bot. Ark. 2 2 : 37. 1914. 



Forming dark brown closely adherent crusts on calcareous rocks or old corals 

 at low-water mark or a little above. New Providence, Rose Island, Atwood Cay, 

 Mariguana, and Caicos Islands : American Virgin Islands ; Canary Islands. Type 

 from the Canary Islands. 



This plant (sterile) bears much resemblance to young prostrate conditions of 

 Zonaria variegata in habit and color, in the apical margin of large cells, and in 

 general structure, but seems to differ in the usually thinner and more closely ad- 

 herent thallus, the absence of frequent or occasional mats or tufts of brown rhiz- 

 oids, and, under the compound microscope, in the more translucent thallus with a 

 more obviously tessellated dorsal surface, 416 cells of the dorsal epidermis corre- 

 sponding to one of the large medullary cells, while in Z. variegata 1-4 (more 

 elongate) epidermal cells correspond to and overlie a single large medullary cell; 

 and, in section, the dorso-ventrality is seen to be more pronounced, the dorsal epi- 

 dermis always consisting of more numerous and smaller cells than the ventral epi- 

 dermis, while in Z. variegata the two epidermal layers are essentially the same. 



Family 6. FUCACEAE. 



1. CYSTOSEIRA Ag. Sp. Alg. 1: 50. 1820. 

 1. Cystoseira Myrica (S. G. Gmel.) Ag. loc. cit. 53. 



Fucus Myrica S. G. Gmel. Hist. File. 88. pi. S. f. 1. 176S. 



On rocks and in tide-pools, near low-water mark. New Providence, Rose Island, 

 Berry Islands, Great Bahama, and Gun Cay : Florida and the Red Sea. Type 

 locality unknown. 



2. TURBINARIA Lamour.; Bory, Voy. Coquille 116. 1S28. 



Petiole wings entire, the lamina usually with vesicle. 1. T. turhinata. 



Petiole wings dentate, the lamina without vesicle. 2. T. tricostata. 



1. Turbinaria turbinata (L.) Kuntze, Rev. Gen. PI. 3: 434. 1898. 



Fucus turbinatus L. Sp. PI. 1160. 1753. (Excluding presumably spurious 



"type" from Sumatra in herb. Linn.). 

 Sargassum turbinatum Ag. Sp. Alg. 1: 41. 1820. . 

 Turbinaria vulgaris trialata J. Ag. Sp. Alg. 1: 268. 181^. 

 Turbinaria trialata Kiitz. Tali. Phyc. 10: 21. pi. 67. 1860. 



On surge-swept rocks, near low-water mark. New Providence, Joulter's Cay, 

 Berry Islands, Great Bahama, Abaco, George Island. Watllng'8 Island, Atwood Cay. 

 Caicos Islands, Great Ragged [aland, and Anguilla Isles: Florida to northern South 



America ; Indian Ocean. Type from Jamaica. 



