SQUAMARIACEAE. 585 



.^. a. Ilnnn, 



4. (j. diHiJiiltttum. 



Thallus plane or becoming verrucose or manimlUate the 

 surface minutely and irregularly tessellated ; coiicep- 

 tacles 30(i-4(K>it in diameter. 

 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. 

 Thallus fruticulose, the Drimary crust usually disappearing or 

 concealed by the erect branches. 

 Branches much anastomosed, compressed oi- sul)terete and 

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

 what foliar and l(»-2r» mm. broad by 1-2 mm. thick. ,". a anonrtuin 

 Branches terete or subterete. 



Plants attached, the intertangled frequently anastomosing 



branches forming rather compact cushions. 0. (j. (Irciitrsmis 



Plants commonly free, the branches mostly erect and strict 

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

 regular or somewhat cervicorn. 7. (!. Htrictum. 



1. Goniolithon solubile Fosl. & Howe, K. Noi>ke Vidensk. Selsk. Skr. 1907": 



21. 1907. 



Goniolitlion Notarisii proinnquum Fosl, loc. cit. 1899'': 21. 1900. 

 Goniolithon inopinquum FobI. loc. cit. 1908'-: 4. 190S. 



Litliophyllum {?) propinquum Lemoine, in Borg. Dansk Bot. Ark. 3': 166. 

 /. 161, 162. 1917. 



The name sohibile appears to be the first name given to this phmt 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. Uose Island, (ireat Bahama. Cat 

 Island, Atwood Cay, Mariguana, and Castle Island : — ^Florida to Barliadus. Type 

 from Culebra Island, I*orto Rico. 



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



2; pi. 91. 1906. 



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



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

 corals or pebbles. Berry Islands. South Cat Cay, Watling's Island, Mariguan:i. and 

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



3. Goniolithon Boergesenii Fosl. K. Norske Vidensk. Selsk. Skr. 1900' : 1 9. 1901. 



Porolithon Boergesenii Lemoine, in Borg. Dansk Bot. Ark. 3': 17S. f. 

 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. Ci-ois. 



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



1908'-: 6. 1908. 

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



5. Goniolithon acropetum Fosl. & Howe, Bull. Torrey Club 33: 577. 19t'6. 



Litliophyllum acropetum Lemoine, in Borg. Dansk Bot. Ark. 3': 151. 1917. 



Sometimes approaching G. Ucoutcscens and G. utrictKin, which appear to inter- 

 grade and forms of which are close to the earlier-published (/. fnttcticcnii of the 

 South Pacific. 



On old corals and calcareous rock in shallow water, (at Island and Salt Cay : — 

 Porto Kico. Type from Culebra Island, I'orto Uico. 



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



muda 538. 1918. 

 Lithothamnium (.?) decutescens Heyd. Bot. .lalirb. 28: 541. pi. 11. f. 7. 



11 Ja 1901. 

 Goniolithon {?) spectabilc FobI. K. Norske Vidensk. Selsk. Skr. 1900' : 16. 



F 1901. 

 38 



