RIVULARIACEAE. 625 



5. Scytonema myochrous Ag. ex Born. & Flah. Ann. Sci. Nat. Bot. VII. 5: 



104. 1887. 



Cat Island, Watling's Island, and Great Ragged Island: widely distributed. 

 Type from Sweden. 



6. Scytonema velutinum Eab. ex Born. & Flah. Ann. Sci. Nat. Bot. VII. 5: 



108. 1887. 



New Providence, Exuma Chain, and Abaco : Europe. Type from Germany. 



7. Scytonema crassum Nag. ex Born. & Flah. Ann. Sci. Nat. Bot. VII. 5: 



109. 1887. 



New Providence : Europe ; Ceylon. Type from Italy. 



Family 6. STIGONEMATACEAE. 



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

 VII. 5: 54. 1887. 



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



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



62. 1887. 



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

 in condition for specific determination. 



Family 7. RIVULARIACEAE. 



1. CALOTHBIX Ag. ex Born & Flah. Ann. Sci. Nat. Bot. VII. 3: 



345. 1886. 



Trichome violet. 1. O. fusco-violacea. 



Trichome olivaceous or aeruginous. 



More or less endophytic. 3. C. parasitica. 



Not endophytic. 



Filaments attached at the middle. 5. C. pilosa. 



Filaments attached at one end. 



Usually epiphytic, forming a bright aeruginous con- 

 tinuous coating; filaments usually &-!()# in diam- 

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

 Usually saxicolous, rarely epiphytic, forming a black- 

 ish green or olivaceous stratum ; filaments 10-18 u, 

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



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



3: 352. 1886. 



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



2. Calothrix scopulorum Ag. ex Born. & Flah. Ann. Sci. 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. Sci. Nat. Bot. VII. 3: 



357. 1886. 



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



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



358. 1886. 



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



