606 BETOPSIDACEAE. 



1. Acetabulum crenulatum (Lamour.) Kuntze, Rev. Gen. PI. 2: 881. 1891. 



Aoetabularia crenulata Lamour. Hist. Polyp. 249. 1816. 



Acetabulum caribaeum Lamarck, Hist. Nat. Ardm. sans Vertfeb. 2: 150. 



1816. 

 Aoetabularia caraibica Kiitz. Tab. Phye. 6: 33. 1856. 



On sandy bottom and on stones, shells, sticks, etc., in shallow rather quiet water 

 (down to 10 meters or more), common. New Providence, Rose Island, Andros, 

 Great Bahama, Green Cay, Exuma Chain, Cat Island, Watling's Island, Mariguana, 

 Caicos Islands, and Great Ragged Island : — Bermuda and southern Florida to Bar- 

 bados. Type from " mer des Antilles" [Santo Domingo]. 



2. Acetabulum polyphysoides (Crouan) Kuntze, Eev. Gen. PI. 2: 881. 1891. 



Acetabularia polyphysoides Crouan ; Solms, Trans. Linn. Soc. Bot. II. 5 : 

 29. pi. 4. f. S, 6. 1895. 



Low-littoral down to a depth of at least 4 or 5 meters. Atwood Cay, Caicos 

 Islands, and Castle Island : — Jamaica and Guadeloupe. Type from Guadeloupe. 



2a. Acetabulum polyphysoides deltoideum M. A. Howe, Bull. Torrey Club 36: 

 92. pi. 6. f. SI; pi. 7. f. 10. 1909. 



Just above low-water mark, with the typical form and with Neomeris Colceri. 

 Atwood Cay (type station of form deltoideum). 



3. Acetabulum pusiUum M. a!. Howe, Bull. Torrey Club 36: 89. pi. 6. f. IS- 



IS; pi. 7. f. 1-4. 1909. 



Acetabularia pusilla Collins, Tufts College Stud. 2: 379. 1909. 



On stones, shells, and film-covered rocks in shallow water, sometimes with A. 

 polyphysoides and A. crenulatum. JIariguana and Castle Island : — Jamaica. Type 

 from Montego Bay, Jamaica. 



A minute plant, only 1—3 mm. high, and the disc averaging about 1.6 mm. in 

 diameter. 



6. ACICULAEIA d'Axeliiac, Mem. Soc. Geol. France 5=: 386. 1843. 

 Solms, Trans. Linn. Soc. Bot. IL 5: 32. 1895. 



1. Acicularia Schenckii (Mob.) Solms, loe. cit. 33. pi. 3. f. 9, 11, 13, 14, 15. 

 1895. M. A. Howe, Bull. Torrey Club 28: 323-331. pi. S4. f. 1-16, 

 18-SS; pi. S5. 1901. 



Acetabularia ScJienclcii Mob. Hedwigia 28: 318-320. pi. 10. f. 8-lS. 1889. 



On stones, etc., from near low-water mark down to a depth of at least 30 

 meters {Ude Borgesen), usually in association with RMzophora. Rose Island': — 

 Bermuda, Jamaica, Porto Rico, American Virgin Islands, Barbados, and Brazil. 

 Type from Cabo Frio, Brazil. 



Family 9. BRYOPSIDACEAE. 



1. BKYOPSIS Lamour. ISTouv. BuU. Sci. Soc. Philom. 1: 333. My 1S09. 



Ultimate ramull 2-ranked, the main axes for the most part 



simply pinnate, commonly naked in lower half. 1. B. pennata. 



Ultimate ramull irregularly disposed. 



Main axes usually deliquescent, the ultimate ramull 



rarely less than 20 ix in diameter at apex. 2. B. hypnoides. 



Main axes persistent, strongly contrasting in size with 

 the various orders of branches and branchlets, the 

 ultimate ramull often only 5—15 /j, in diameter at apex ; 

 plant very gelatinous. 3. B. DuchassaingU. 



1. Bryopsis pennjlta Lamour. loc. cit.; Jour, de Bot. 2: 134. pi. 7. f. 1 a, l. 



1809. 



On stones at low-water mark. Atwood Cay and Caicos Islands : — Bermuda to 

 Barbados. Type from " Antilles." 



