VALONIACEAE. 603 



7. DICTYOSPHAERIA Deeaisne, Ann. Sci. Nat. Bot. II. 17: 328. 1842. 

 1. Dictyosphaeria favulosa (Ag.) Decaisne, loc. cit. 

 Valonia favulosa Ag. Sp. Alg. 1 : 432. 1822. 



Common, especially on old corals in shallow warm water. New Providence, 

 Andros, Great Bahama, South Cat Cay, North Cat Cay, Bimini, Green Cay, Watling's 

 Island, and Mariguana : Bermuda and Florida to Barbados ; widely distributed in 

 the warmer seas. Type from the island of Rawak, Dutch East Indies. 



8. VALONIA Ginn.; Ag. Sp. Alg. 1: 428. 1822. 



Thallus simple or subsimple, ovoid, obovoid, pyriform, or sub- 

 globose, mostly 1.5-5 cm. in maximum diameter. 1. V. ventricosa. 

 Thallus branched. 



Cells mostly 5-10 mm. broad, obovoid or pyriform, occa- 

 sionally subglobose ; thallus sparingly or rather copiously 



branched. 2. V. macrophysa. 



Cells mostly 0.45-2 mm. broad. 



Cells all subcylindric or subclavate ; thallus, under favor- 

 able conditions, forming subglobose, solid or finally 



hollow, free or attached masses 4-20 cm. in diameter. 3. V. Aegagropila. 

 Cells in superior or dorsal parts irregularly polyhedral or 

 angulate-subglobose ; those of descending inferior or 

 ventral parts subcylindric ; thallus cespitose or crus- 

 taceous. 4. "F. ocellata. 



1. Valonia ventricosa J. Ag. Till Alg. Syst. 5: 96. 1887. 



Under shelving rocks at low-water mark and among corallines and " mossy " 

 algae in shallow water. Rose Island, Berry Islands, Great Bahama, North Cat Cay, 

 South Cat Cay, Abaco, Eleuthera, Exuma Chain, Cat Island, Mariguana, and Caicos 

 Islands : Bermuda to Barbados. Type from St. Croix. 



2. Valonia macrophysa Kiitz. Phyc. Gen. 307. , 1843. 



Under shelving rocks at low-water mark and on and among other algae and 

 corals in shallow water. Berry Islands, Great Bahama, Eleuthera, Atwood Cay, 

 Mariguana, and Caicos Islands : Bermuda, Cuba, Jamaica, and American Virgin 

 Islands ; Mediterranean and Adriatic seas. Type from the island of Lessina, in the 

 Adriatic Sea. 



3. Valonia Aegagropila Ag. Sp. Alg. 1: 429. 1822. 



Valonia utricularis Aegagropila Hauck, in Eabenh. Krypt.-M. 2: 469. 



1885. 



In shallow water and at its best in lagoons. New Providence, Rose Island, 

 Great Bahama, North Cat Cay, Watling's Island, Atwood Cay, Mariguana, and 

 Caicos Islands : Cuba, Jamaica, Porto Rico, and American Virgin Islands ; widely 

 distributed in the warmer seas. Type from the lagoons of Venice. 



4. Valonia ocellata M. A. Howe, sp. nov. 



Plants for the most part filamentous, densely cespitose or crustaceous, the 

 cushions, under favorable conditions becoming 10-20 cm. broad and 4-6 cm. 

 thick; the superior or dorsal parts consisting of small few-celled discs, or more 

 often, oblong or linear, irregular, multicellular filaments mostly 1-4 cells broad, 

 the cells polyhedral or angulate-subglobose, 0.450.9 mm. in maximum diameter, 

 with numerous small flattened ellipsoidal or lentiform cells 50-90 /w in long 

 diameter along their separating walls; few or many of the ventral and lateral 

 cells of the superior or dorsal facetted parts growing out into rather rigid 

 descending stilt-like or root-like non-septate processes, mostly 5-30 mm. long 

 and 0.50.8 mm. in diameter; occasional cells in dorsal parts enclosing few or 

 numerous aplanospores 200-320 //. in diameter. 



In shallow water in lagoons, on pneumatophores of Avlcennia between the tide- 

 lines, and low-littoral on rocks, both in exposed and sheltered locations, common. 

 New Providence, Bimini, Watling's Island, Atwood Cay, Mariguana, and Caicos 

 Islands : Bermuda, Porto Rico, and American Virgin Islands. Type, Howe 5090 

 from the great lake or lagoon of Watling's Island, Nov. 25, 1&07. 



