CHROOCOOC'ACEAE. 619 



5091 ay^ef'^Sfl^^fm'^ '^ ^^^* ^''"''' '^^''^^•'"^'s Island, November 25. 1907, J/. ^. //oicc 

 The genei-iU gelatine is very thin, hardly perceptible except by use of stains: 

 at first glance the plant would be taken for a si)ecie8 of tiyncchucyntiH. Some of the 

 cells, usually those near the surface of the colonv, show a thlck<-r icgum.-nt outside 

 the very thin cell wall. Its nearest relative appears to be A. Ztniardlnii (Hiiuck) 

 Hansg.* of Southern Europe and liorneo, which has cells of much the same dlim-n- 



* The record in Forti, Syll. Myx. 68. of the occurrence of A. Zanardinii In North 

 America "Massachusetts (Collins) " is wrong. The writer has never found it and 

 has never seen American material. 



sions, but of deeper color " viridi-smaragdino," and arranged by '2 or 4 in a llrmer, 

 more sharply defined common gelatine. 



3. GLOEOCAPSA Kiitz. Phyc. Gen. 173. 1843. 



Marine ; teguments brownish. 1. a.huhnimnsiH. 



Terrestrial. 



Teguments red; cells 4.5-7^ in diameter. 2. (J.Mdumn. 



Teguments violet or steel-blue; cells 2.5-3. 5^ in diameter. 3. 0. liutiirola. 



1. Gloeocapsa 'bahamensis Collins^ sp. nov. 



Marina. Cellulis indivisis 4-8 fi diam., sine mcmhrana 3-5 n, pallide 

 aerugineis, in familias 4-24 cellularum unitis; tegunientis amplis, distinetis, 

 lamellosis, sub- vel perfuscis; familiis sparsis vel inter myxophyceas varias in 

 crustam fuscam compactis. 



Undivided cells 4-8 a'' in diameter, without wall 3-5 m in diameter, pale 

 aeruginous; teguments wide, lamellose, distinct, lighter or darker brown; fam- 

 ilies scattered or loosely compacted with other Myxophyceae into a brownish 

 crust. 



On the border of a salt pond, east end of Mariguana, December 12, U>u7, .1/. .t. 

 Howe 5538 (type). 



The cells in this material are dividing so rapidly that single free cells are seldom 

 seen ; the wide teguments may persist through many generations of cell division. 

 G. crepidinum Thuret, the best known and most generally distributed species, has thin 

 and rather inconspicuous teguments, the cells, not including the walls, larger, the 

 color brownish. O. deusta (Menegh.) Kiitz. also has larger cells and thinner tegu- 

 ments, with cells and teguments dark green to blackish. 



2. Gloeocapsa Magma (Breb.) Kiitz. Tab. Phyc. 1: 17. pi. SIS. f. 1. 1847. 



Protococciis Magma, Breb. Alg. de Falaise, 40. pi. 4. 1836. 



Among other blue-green algae, New Providence : — of wide distribution Inland In 

 warm and temperate regions. Type from France. 



3. Gloeocapsa lignicola Eab. Fl. Eur. Alg. 2: 41. 18G5. 



On bark, New I'rovidence, first American record : — I-]urope. Type inmi France. 



4. ENTOPHYSALIS Kiitz. Phyc. Gen. 177. 1843. 

 1. Entophysalis violacea Collins, sp. nov. 



Marina. Cellulis sphaericis, 4-5 fi diam., sine membrana 2-3 n diam., 

 elongatis ante divisionem, atroviolaceis, membrana hyalina, incolori vel plus- 

 minus coerulescente; cellulis 2, interduni 4, in membrana matricali persi.stente, 

 series longitudinales indefinitas formantibus; seriebus dense comi)actis in stra- 

 tum tenue firmum nigrum. 



•Cells with wall sj)herical, 4-5 /jl in diameter, becoming elongate when 

 dividing, without wall 2-3 /x in diameter, color dark violet, wall translucent, 

 colorless or more or less bluish; cells usually 2, occasionally 4 in the mother- 

 cell wall, in indefinite longitudinal series, closely packed to form a thin smooth 

 black crust. 



On rocks at low water mark, Atwood Cay, December 3, 1907, M. A. Hotcc 52S2 

 (type) . 



e! granulosa Kiitz., the type of the genus, forms a thicker, warty and grnnulnr 



