o86 CORALLINACEAE. 



? Goniolithon Rhizophorae Fosl. & Howe, Bull. N. Y. Bot. Gard. 4: 130. pi. 

 82. f. 2. 1906. 



? Goniolithon strictum nanvwm Fosl. & Howe, loe. cit. 131. pi. 82. f. 7. 

 ? Lithophyllum strictum nanum Lemoine, in Borg. Dansk Bot. Ark. 3 1 : 164. 

 /. 159, 160. 1917. 



On rocks, old corals, shells of (sometimes living) molluscs, etc., in shallow water, 

 common, Rose Island, Berry Islands, Great Bahama, North Cat Cay, South Cat Cay, 

 Eleuthera, Exuma Chain, Watling's Island, Caicos Islands, and Great Ragged Island : 

 Bermuda and Florida to American Virgin Iglands. Type from Bermuda. 



7. Goniolithon strictum Fosl. K. Xorske Vidensk. Selsk. Skr. 1900": 14. 1901. 



Goniolithon intermedium Fosl. loc. cit. 15. 



Lithophyllum strictum Lemoine, in Borg. Dansk Bot. Ark. 3 1 : 164. 1917. 



Mostly unattached or forming mats, in shallow water, common, New Providence, 

 Rose Island, Andros, Berry Islands, Bimini, North Cat Cay, Cat Island, Watling's 

 Island, and Mariguana : Bermuda ; Florida ; and Jamaica. Type from Florida. 



4. LITHOPHYLLUM Philippi, Wiegm. Archiv Naturgesch. 



3 1 : 387. 1837. 



Conceptacles 80-160 broad, usually abundant; thallus thin 

 ( 100-300 thick), its surface nearly smooth or roughened by 

 substratum. 1. L. caribaeum. 



Conceptacles 200-600 in diameter. 



Thallus thin (mostly 50-600 thick), smooth, forming subor- 

 bicular crusts 2-10 mm. broad, epiphytic ; vertical section 

 showing small cells in superficial layer only. 2. L. pustulatum. 



Thallus usually thin (200-500^; very rarely 5-10 mm. 

 thick) ; the surface showing imbricate, reniform-auriculate 

 or semiorbicular lamellae ; vertical section showing a regu- 

 lar alternation of vertically elongate cells and very short 



flattened or discoid cells ; usually on shells, old corals, etc. 3. L. prototypum. 

 Thallus 0.5 mm.-6 cm. thick ; the surface with densely 

 crowded knobs, verrucae, or short branches ; vertical sec- 

 tions showing irregular, often subcrescentic or sublunate 

 zonations ; conceptacles 200-300 in diameter, becoming 

 overgrown and included. 4. L. munitum. 



1. Lithophyllum caribaeum (Fosl.) Fosl. K. Norske Vidensk. Selsk. Skr. 1906 s : 



22. 1907. 



Lithophyllum decipiens caribaeum Fosl. loc. cit. 1906 2 : 18. 1906. 



Forming thin white or light pink crusts on rocks, pebbles, and shells from just 

 above low-water mark down to 15 fathoms (/fde Borgesen), Watling's Island and 

 Great Ragged Island : Jamaica and American Virgin Islands. Type from the West 

 Indies. 



2. Lithophyllum pustulatum (Lamour.) Fosl. K. Norske Vidensk. Selsk. Skr. 



1904 2 : 3. 1904. 



Helooesia pustulata Lamour. Hist. Polyp. 315. pi. 12. f. 2. 1816. 

 Dermatolithon pustulatum Fosl. K. Norske Vidensk. Selsk. Skr. 1900 5 : 21. 

 1900. 



On Dilophus, Dictyota. Saryassum, Halimeda and Thalassia, in shallow water, 

 Berry Islands, North Cat Cay, Watling's Island, Atwood Cay, and Little Inagua : 

 New England to Jamaica ; Europe. Type from France. 



3. Lithophyllum prototypum Fosl. K. Norske Vidensk. Selsk. Skr. 1897 1 : 18. 



1897. 



Dermatolithon (7) prototypus Fosl. loc. cit. 1900 5 : 22. 1900. 



On old corals, shells, etc., near low-water mark or in shallow water, Exuma 

 Chain and Atwood Cay : Florida ; Jamaica ; Porto Rico ; and American Virgin 

 Islands. Type from St. Croix. 



