NEMALIONACEAE. 555 



of the stout cylindrie assimilatory filaments beyond the axial calcification and 

 in the characters of the cystocarp. Monosporangium-bearing discs, looking like 

 epi-endophytes, but probably arising from gemmae of the Liagora, occur, espe- 

 cially on antheridial plants. 



On rocks and stones from low-water mark down to a depth of at least two 

 meters, New Providence, Great Bahama, Gun Cay, South Cat Cay, Berry Islands, 

 Exuma Chain, Mariguana, and Little Inagua : — Bermuda; Florida; Cuba ;' Jamaica ; 

 St. Croix : Barbados ; of wide distribution in tropical and subtropical seas. Type 

 from the Red Sea, near Suez. 



2. Liagora valida Harv. Ner. Bor.-Am. 2: 138. pi. 31A. 1853. 



Liagora annulata J. Ag. (in part, at least) Sp. Alg. 3: 518. 1876. 

 Liagora tenuis J. Ag. p. p. max., Anal. Alg. Cont. 3: 101. 1896. 

 Liagora rosacea Zeh, Notizbl. Konigl. Bot. Gart. Berlin 5: 271. 1912. 



Extremely variable in size and habit, in the amount of calcification, in 

 presence or absence of annulations, in the compactness of the cortex, in the sub- 

 parallel or subumbellate disposition of the distal branches of the assimilatory 

 filaments, and in the form and size of the peripheral cells, yet specific segrega- 

 tions seem to the writer to be impracticable. Plants growing on surf-beaten 

 rocks between the tide-lines form rigid brittle closely adherent cushions sug- 

 gesting fruticulose Lithothamnieae or species of the lichen genus Cladonia; 

 those growing below the low-water line or in less agitated water are longer, 

 laxer, less heavily calcified, and more flexible. In intermediate positions, forms 

 of intermediate habit occur. Certain conditions of the species appear to be 

 close to Liagora fragilis (Forsk. ?) Zanard. and L. rugosa ZanarcL, from the 

 Eed Sea, with which they may need further comparisons. 



On rocks from near the high-water marli, in exposed positions, down to a depth 

 of at least one meter (low-tide), New Providence, Great Bahama, Berry Islands, 

 North Cat Cay, South Cat Cay, Gun Cay, Andros, Orange Cay, Exuma Chain, Eleu- 

 thera, Watling's Island, Mariguana, and Caicos Islands :— Bermuda ; Florida ; Cuba ; 

 Jamaica ; Porto Rico ; St. Croix ; and Barbados. Type from Sand Key, near Key 

 West, Florida. 



3. Iiiagora ceranoides Lamour. Hist. Polyp. 239. 1816. 



Liagora imlverulenta Ag. Sp. Alg. 1: 396. 1822. 



Liagora leprosa J. Ag. 6fv. Kongl. Vet.-Akad. Forh. 4: 8. 1847. 



Liagora opposita J. Ag. Anal. Alg. Cont. 3: 101. 1896. 



Liagora Pilgeriana Zeh, Notizbl. Konigl. Bot. Gart. Berlin 5: 272. 1912. 



This species, also, as here conceived, shows great variation in size and habit, 

 in the amount of calcification, and in the presence or absence of lateral pro- 

 liferations, yet is fairly constant in the alveolate or farinaceous-pulverulent 

 character of the surface of the dried plant, in the small subglobose or ovoid 

 ultimate or penultimate cells of the assimilatory filaments, in the compact, 

 many-filamented, small-spored cystocarp, and in the highly developed cysto- 

 carpic involucre of numerous long ascending or partly encircling filaments. 

 Monosporangium-bearing discs, apparently arising from gemmae, are of fre- 

 quent occurrence on both antheridial and cystocarpic plants. 



On rocks, stones, and shells and on other algae from low-water mark down to a 

 depth of two meters or more (taken at a depth of twenty meters by Borgeseu in the 

 American Virgin Islands), Great Bahama, North Cat Cay, Gun Cay, Berry Islands, 

 Mariguana, Caicos Islands, Little Inagua and Castle Islands : — Bermuda ; Florida ; 

 Jamaica ; Porto Rico ; American Virgin Islands ; Barbados ; Mexico ; Brazil ; of wide 

 distribution in tropical and subtropical seas. Type from St. Thomas, American 

 Virgin Islands. 



4. Liagora pinnata Harv. Ner. Bor.-Am. 2 : 138. pi. 31B. 1853. 



Liagora paniculata J. Ag. Anal. Cont. 3: 106. 1896. 



On rocks, etc., from low-water mark down to a depth of at least two meters, 

 Great Bahama, Berry Islands, and Exuma Chain : — Florida ; Jamaica ; and St. Croix. 

 Type from Sand Key, near Key West, Florida. 



