SQUAMARIACEAE. 585 



Thallus plane or becoming verrucose or rnammillate, the 

 surface minutely and irregularly tessellated : concep- 



tacles 300-40O w in diameter. 3. G. Boergesenii. 



Thallus with rounded-obtuse or subtruncate warts or 

 bosses 4-10 mm. broad and high ; superficial layers 

 exfoliating along concentric or zonate lines ; conceptacles 



1-1.2 mm. in diameter. 4. G. dispalatum. 



Thallus fruticulose, the primary crust usually disappearing or 

 concealed by the erect branches. 

 Branches much anastomosed, compressed or subterete and 

 1.25-3.1 mm. in diameter, or becoming fiabellate or some- 

 what foliar and 10-25 mm. broad by 1-2 mm. thick. 5. G. acropetum. 

 Branches terete or subterete. 



Plants attached, the intertangled frequently anastomosing 



branches forming rather compact cushions. 6. G. decutescens. 



Plants commonly free, the branches mostly erect and strict 

 or, in free-lying conditions, few, elongate, and very ir- 

 regular or somewhat cervicorn. 7. G. striatum. 



1. Goniolithon solubile Fosl. & Howe, K. Norske Vidensk. Selsk. Skr. 1907 8 : 



21. 1907. 



Goniolithon Notarisii propinquum Fosl. loe. cit. 1899 5 : 21. 1900. 

 Goniolithon propinquum Fosl. loc. cit. 1908 12 : 4. 1908. 

 Lithophyllum (?) propinquum Lemoine, in Borg. Dansk Bot. Ark. 3 1 : 166. 

 /. 161, 162. 1917. 



The name solubile appears to be the first name given to this plant in the 

 specific category, propinquum antedating it as a form name only. 



On old corals, coral 'pebbles, and old shells in shallow water, sometimes cover- 

 ing and smothering living corals of fruticose habit, Rose Island, Great Bahama, Cat 

 Island, Atwood Cay, Mariguana, and Castle Island : Florida to Barbados. Type 

 from Culebra Island, Porto Rico. 



2. Goniolithon accretum Fosl. & Howe, Bull. X. Y. Bot. Card. 4: 131. pi. 85. f. 



2; pi. 91. 1906. 



Lithophyllum accretum Lemoine, in Borg. Dansk Bot. Ark. 3 1 : 159. 1917. 



On surf-beaten limestone rocks near low-water mark or in tide-pools or on old 

 corals or pebbles. Berry Islands. South Tat Cay. YVatling*s Island, Mariguana. and 

 Castle Island : Florida to American Virgin Islands. Type from Sand's Key, Florida. 



3. Goniolithon Boergesenii Fosl. K. Norske Vidensk. Selsk. Skr. 1900": 19. 1901. 



Porolithon Boergesenii Lemoine, in Borg. Dansk Bot. Ark. 3 1 : 17S. /. 

 168, 169. 1917. 



On old shells, corals, and calcareous pebbles in shallow water. Berry Islands, 

 Mariguana, and Caicos Islands : Florida to Barbados. Type from St. Croix. 



4. Goniolithon dispalatum Fosl. & Howe, K. Norske Vidensk. Selsk. Skr. 



1908 12 : 6. 1908. 



On calcareous rocks at low-water mark, Atwood Cay. Type from Atwood Cay. 



5. Goniolithon acropetum Fosl. & Howe, Bull. Torrey Club 33: 577. 1906. 



Lithophyllum acropetum Lemoine, in Borg. Dansk Bot. Ark. 3 1 : 151. 1917. 



Sometimes approaching G. deoutescens and G. strictuin, which appear to lnter- 



frade and forms of which are close to the earlier-published G. fruteacens of the 

 out li Pacific. 



On old corals and calcareous rock in shallow water, Cat Island and Salt Cay : 

 Porto Rico. Type from Culebra Island, Porto Rico. 



6. Goniolithon decutescens (Heyd.) Fosl.; M. A. Howe, in Britton, Fl. Ber- 



muda 538. 1918. 



Lithothamnium (?) decutescens Hevd. Bot. Jahrb. 28: 541. pi. 11. f. 7. 



11 Ja 1901. 

 Goniolithon (?) spectabile Fosl. K. Norske Vidensk. Selsk. Skr. 1900 ,; : 16. 



F 1901. 



38 



