RIVULARIACEAE. 625 



5. Scytonema myochrous Ag. ex Born. & Flah. Ann. Sei. Xat Rot VII 5- 



104. 1887. ■ ■ 



Cat Island. Watlings Island, and Great Ragged Island :— widely dlBtrlhutcd. 

 Tj'pe from Sweden. 



6. Scytonema velutinum Rab. ex Born. & Flah. Ann. Sei. Xat Bot VTT 5- 



108. 1887. 



New^ Providence, Exuraa Chain, and Abaco :— Europe. Type from Gt-rmany. 



7. Scytonema crassum Nag. ex Born. & Flah. Ann. Sei. Nat. Bot VH 5- 



109. 1887. 



New Providence: — Europe; Ceylon. Type from Italy. 



Family 6. STIGONEMATACEAE. 



1. MASTIGOCOLEUS Lagerheim, ex Born & Flah. Ann. S.i. Nat Bot 

 VII. 5: 54. 1SS7. 



1. Mastigocoleus testanim Lagerheim, ex Born. & Flah. loc. cit. 



2. STIGONEMA Ag. ex Born. & Flah. Ann. Sei. Nat. Bot. VII. 5: 



62. 1887. 



Fragments of a Stiponema have been found mixed with other algae, but not 

 in condition for specific determination. 



Family 7. RIVULARIACEAE. 



1. CALOTHRIX Ag. ex Born & Flah. Ann. Sei. Nat. Bot. VII. 3: 



345. 1886. 



Trichoma violet. 1. C. fuMcoviolacca. 



Trichome olivaceous or aeruginous. 



More or less endophytic. 3. C. txira^itica. 



Not endophytic. 



Filaments attached at the middle. o. C. inhtna. 



Filaments attached at one end. 



Usually epiphytic, forming a bright aeruginous con- 

 tinuous coating; filaments usually O-lO^t in diam- 

 eter; intercalary heterocysts often present. 4. C.acrufjinea. 

 Usually saxicolous, rarely epiphytic, forming a black- 

 ish green or olivaceous stratum ; filaments lo-lS^i 

 in diameter; heterocysts basal. 2. C. sropulorum. 



1. Calothrix fusco-violacea Crouan, ex Born. & Flah. Ann. Sei. Nat. Bot. VII. 



3: 352. 1886. 



New Providence : — Europe ; North America. Type from France. 



2. Calothrix scopulonim Ag. ex Born. & Flah. Ann. Sei. Nat. Bot. VII. 3: 



353. 1886. 



In small quantities, with other algae: — widely distributed. Type from Great 

 Britain. 



3. Calothrix parasitica Thuret, ex Born. & Flah. Ann. Sei. Nat. Bot. \\\. 3: 



357. 1886. 



In small quantities, with other algae: — widely distributed. Type from France. 



4. Calothrix aeruginea Thuret, ex Born. & Flah. Ann. Sei. Nat. Bot. VII. 3: 



358. 1886. 



Berry Islands and Great Bahama : — widely distributed. Type from Germany. 



