THE FLORA OF M.r.i: LSK \. 23 



«. BEGGIATOA Trevisan Prosp. Flor. Eugan. 76. 1842. 



Filaments imbedded in a colorless, gelatinous matrix, long, rigid, usually in 

 distinctly jointed, actively oscillating, colorless; protoplasm ailed with 



strongly rofrangent sulphur granules. 

 Etymology: dedicated to Beggiato, an Italian botanist 



Beggiatoa alba (Vauch.) Tbsv. Nomencl. 58. L845. 

 Osdllaria alba Vacjcheb Hist. Conf. L98. 18C0. 



Filaments without distinct articulations, 3 3'^ a thick, Forming dirty or 



chalk white gelatinous masses. 

 Common in saline water in Lancaster county; it will doubtless be found 

 everywhere in the state where there is brackish water. 



Var.— marina Cohn. Hedwigia 1885, p. 82. 



Threads very densely filled with granules, 2 ft thick. 



With the last, often found in jars of algae which have stood for some Ume in 

 the laboratory. PI. II., Fig. 29. 



Beggiatoa pellneida Cohx Hedwigia 18G5, p. 82. 



Filaments distinctly jointed, with rounded ends, H , ;. u wide; articulations 



about as long as broad, translucent, containing a few granules. 

 In jars of algae standing in the laboratory. PI. II., Fig. 27. 



Beggiatoa arachnoidea (Ag.) Rabh. Fl. Eur. Alg. II., 94. 1865. 

 Osdllaria arachnoidea Ag. Regensb. Flora 1S-J7, p. 634. 



Filaments distinctly jointed, strongly motile, with rounded, slightly curved 



ends, 5-7 /i thick; articulations half as long to as long as broa I. 

 In water from the salt basin at Lincoln. PI. 1 1., Pig. 28. 



7. ARTHROSPIRA Stizenberger Hedwigia I., :;-J. 1852. 



Filaments cylindrical, without sheaths, regularly twisted into a more or less 



lax spiral, apical cell rounded or attenuate. 

 Etymology : Greek apdpov, joint, and oneipa, coil. 



Arthrospira jenneri (Hass.) Stizenberger 1. c. 



Spirillum jenneri Hassall Brit. Freshw. Alg. 277. 1815. 

 Spirulina jenneri Kuetz. Tab. Phyc. I., 2Gt. 37. 1845. 



Filaments usually light aeruginous, forming slender strata, or found solitary 

 among other algae, 7-15 fi in diam.; apex hut slightly narrowed. 5 B broad 

 making a complete coil in every 20 21 //; cells from as long to twice as long 

 as wide. 

 Found occasionally in stagnant water about Lincoln. PL I.. Pig. 7. 



8. SPIRITLdmA Tuupin in Levrault Diet. 309. 1827. 



Filaments unicellular, slender, spirally twisted, apex rounded; protoplasm 

 homogeneous or slightly granular ; usually surrounded by a somewhat 



liquid, colorless mucilage. 

 Etymology: diminutive, from Latin spira, coil. 



Spirulina *ul»*al«a Oersted \at. Tidskr. 1842, p. 17. 

 Spirulina subsalsa Kuetz. Tab. Phyc. I. 26, t. :!7. 1843. 

 Spirulina tenuissima Kuetz. Phyc. Gener. 183, 1843. 



Filaments flexuose, more or less densely spiral, with active movemenl ; Bpirals 



4-5 n in diam., making 5 7 turn-- in the space of 26 

 Frequent in salt water, Lincoln. PI. 1., Pig. 0. 



