Plicélleaph. 1. HYDROPHYT. -14,-Diatoma. 295 
aan. 14. DIATOMA. De Candolle. ‘Diatome. 
Threads jointed, flat, simple, coupled throughout their 
whole length; 3 joints separating, but remaining adherent 
by their alternate angles, with a longitudinal band formed 
by the coupling together ‘of the threads. 
A. Diatoma Swartzii. Swartz s diatome. 
Presh water; threads light-ereen ; joints half as long:as 
‘broad, crenately notched. on: both edges,. when uncoupled 
triangular. 
'Diatoma Swartzii, Agardh Syn. 118. 
Ditches and stagnant waters, among conferve. 
Threads very brittle, slimy, when coupled separating 
mitten into joints on the least touch. 
eH Bistono Jlocculosum. Flocculent diatome. 
Fresh-water ; threads hyaline, forming brownish tufts ; 
joints rather broader than long, transver sely pinqaliods band 
longitudinal, pellucid. 
_Conferva flocculosa, Roth Cat. 1,192; Engl; Bot. 1761, 
Diatoma flocculosa, Agardh Disp. ed. 1, 39. 
Tuft small; threads very minute; joints 4-cornered, edge 
even. 
8. Diatoma tenue. Slender diatome. 
fresh-water; threads very small, reddish and brownish ; 
joints 8 times as.long as broad, transversely streaked ; band 
longitudinal, pellucid. 
Conferva flocculosa, FV. Dan. 1487. 
Diatoma tenuis, 4gardh Decad, 10. 
Diatoma flocculosa 6, Agardh Syn, 120. 
In ditches, on confervze. 
Threads very minute, stiff, hyaline. 
4, Diatoma marinum. Sea diatome, 
Marine; threads simple, in tufts, yellowish ; joints half 
as long again as broad, with ovate, transverse et anules. mid 
Boooe: flocculosum? De Candolle Fl. Fr. 2,48. ¢e 
Diatoma marinum, Lyngbye Hydr. Dan. 180. 
On marine plants ; summer. 
.. Tufts small, i brownish; threads very. slender: jents as 
long or twice as long as broad. G2 
