THE \I.<. \i: OF BERMUDA. 



NbSTOC Vaucher. 



*N. commune Vaucher ex Bomet & Flahault, 1888, p. 203; P. B.-A., 

 No. 1901 ; N. ciniflonum Bomet & Thuret, 1880, p. 102, PL XXVIII, 

 fig. 13. Common everywhere, especially on sandy soil; thin brittle 

 skins in dry weather, expanded thickish soft masses in wet weather. 

 No spores seen. Native name, "Devil's Tobacco." 



Family SCYTONEMACEAE Kiitzing. 

 Microchaete Thuret. 



M. vitiexsis Askenasy ex Bomet & Flahault, 1887, p. 85. Scat- 

 tered filaments on Wrangclia penicillata, Harris Bay, Jan., Hervey. 



St TTONEMA Agardh. 



1. Sheaths not lamellate. 2. 



1. Sheaths lamellate. 3. 



2. Trichomes 5-7 n diam. 1. S. varium. 



2. Trichomes 6-14 n diam. 2. S. ocellatum. 



3. Branches usually geminate, free and divergent. 4. 



3. Branches frequently solitary, adherent at base. 5. S. crustaceum. 



4. Filaments 15-21 ^ diam.; .sheath thin at apex. 3. S. figuratum. 



4. Filaments 18-36 /x diam.; sheath thick throughout. 4. S. myochrous. 



*1. S. VARIUM Kiitzing ex Bomet & Flahault, 1887, p. 97; Kiitzing, 

 1850-52, p. 6, PI. XXIII, fig. II. High up on walls of a cave at Wal- 

 singham; shore of pool near Walsingham, April, Collins. 



*2. S. ocellatum Lyngbye ex Bomet & Flahault, 1SS7, p. 95; 

 P. B.-A., No. 711, on dunes, Paget, Farlow. 



*3. S. FIGURATUM Agardh ex Bomet & Flahault, 1887, p. 101; 

 8. thermale Kiitzing, 1850-52, p. 5, PL XVIII, fig. III. High up on 

 wall of cave near Walsingham, April, ( !ollins. 



Bornet, 1889a, p. 155, shows that Conferva mirabiMs Dillwyn, 1807, 

 PI. XCVT, is identical with Scytonema figuratum of Agardh, and of 

 earlier date, and therefore changes the name to S. mirobile (Dillw.) 

 Bornet. But as the starting point for nomenclature of the hetero- 

 eysted Nostochaceae is definitely fixed at the Bornet »x Flahault 

 monograph, it appears as if the later name by Bornet cannot be sub- 

 stituted. 



