Dr George Lawson on Lemania variegata of Agardh. 33 
“ Lemania variegata, Agardh, Act. Holm., 1814, tab. 
2, fig. 3.” (Agardh.) 
“ Lemania variegata” (Agardh), Species Algarum, 
vol, 1. page 7, 
In the bed of the Moira above Belleville, Canada West, 
on rocks, rare (August 1862), John Macoun, sp. “‘ In fluviis 
Americe borealis. Specimina a Muhlenbergio missa com- 
municavit Swartz” (Agardh). 
The following eight forms of this extremely interesting 
genus have been described by Agardh :— 
1. L. fluviatilis = (Conferva fluviatilis lubrica setosa, Equiscti 
facie, Horse-tail River Conferva, Dillenius, Hist. Musc., 
tab. vii. fig. 47. Conferva fluviatilis, Zinn., Mohr, Roth., 
&e. Polysperma fluviatilis, Vauch. Chantransia fluvia- 
tilis, DC. Lemania corallina, Bory. Nodularia fluvia- 
tilis, Zyngb.) This is the more common British species * 
which I gathered in quantity in a stream on the Ochil 
Hills, near Stirling, in 1857. It has also been recorded 
as growing near Bangor (Duillenius), in Winterbourne 
Stream, Lewes (W. Borrer); at Hamsell, and at the 
waterfall at Harrison’s rocks (H. Jenner); Aberdeen, 
abundant (Professor Dickie, M.D.); Ireland, frequent (D. 
Moore); Scandinavia, Germany, France, Corsica. 
2. 6. tuberculosa = (Nodularia fluviatilis ramosa, Lyngb.) 
Denmark, 
3. y. media = (Conferva fluviatilis, Dillw., E.B., t. 176 3). 
England. 
4, 6. fucina = (Lemania fucina, Bory. Chantransia dichotoma, 
DC. France, chiefly in Bretagne. 
6. s. subtilis = (Lemania subtilis, Agardh (in Act. Holm. 1814, 
t. 2, f. 4, Kiitzing.) Sweden, &c. 
6. L. torulosa = (Conferva fluviatilis nodosa Fucum emulans,. 
Sea Horse-tail-like Conferva, Dill. Hist. Muse. tab. vii. 
fig 48. Conferva torulosa, Roth., Mohr., Dillw.,&e. Le- 
mania incurvata, Bory.) Recorded as occurring in moun- 
tain streams near Ludlow, Salop (.Dillenius), Anglesea (Rev. 
H, Davies); also in France, Germany, Kentucky, United 
States (Dr Short in Harvey, Nereis), 
8. usneoides = (Conferva usneoides, Wallr.) Saxony. 
. L, variegata = (Hippuris fluviatilis petreea nuda Virginiensis, 
Pluk.) Belleville, Canada West (JJ. Macoun,) United 
States, Pennsylvania? (Miihlenberg). 
aaa 
Probably L. fluv., ¢. subtilis, and L. torulosa, 8. usneotdes, 
NEW SERIES,—VOL. XVIII. NO. I.—JuLy 1863. E 
