374 xx. vaginarie.k (West). [Schizothrix 
XX. VAGINARIEjE. 
1. SCHIZOTHRIX Kiitz. (1843). 
I.S. elongata W. et G. S. West in Journ. Bot, 1897, p. 2 G 9. 
Huilla. — Inter Hapalosiphonem luteolum et Microsporam L&fgrenii, 
etc., in uliginosis editioribus prope Humpata, Empalanca et Lopollo : 
May 1800. No. 15. 
This differs from the other allied species in several noteworthy 
features, such as the extremely long flexuose attenuate filaments with 
few branches, the long cells, and the somewhat close cylindrical sheath. 
2. S. delicatissima W. et G. S. West in Journ. Bot. 1897, p. 269. 
PuNGO ANDONGO. — Cum Tolypotriche arenophila, ad terram arenoso- 
humosam in editissimis rupibus Pra>sidii, Pedra Cazella : Jan. 1857. 
No. 151. 
This species is very easily overlooked on account of its minute size 
and delicacy. 
3. S. Friesii Gomont in Ann. Sci. Nat. 7 e serie, Bot. xv. 316-18. 
t. 9, f. 1, 2 (1892) ; W. et G. S. West in Journ. Bot, 1897, p. 270. 
Oscillatoria Friesii Ag. Synops. Algar. Scand. 107 (1817). 
Huilla. — Alga gelatinosa, badio-fusca, folia Nyridearum in editis 
de Morro de Lopollo obducens ; Feb. 1860. No. 192. 
4. S. thelephoroides Gomont, I.e., 319, 320, t, 10, f. 1-4 (1892) ; 
\V. et G. S. West, I.e. 
Scytonema ? thelephoroides Montagne, I.e., 2'' ser. Bot. xii. 45 
(1839). 
Huilla. — In paludibus exsiccandis ; April 1860. No. 176- 
A few small examples of this species occurred in this gathering ; we 
should like to have seen more of it, as it appears to be an aquatic form 
of the species. 
5. S. fuscescens Kiitz. Phyc. Gener. 230(1843); Gomont, I.e., 
324-5, t. 11, f. 4-6 (1892) ; W. et G. S. West, I.e. 
Huilla. — Freq. apud Hapalosiphonem aureum, in paludibus exsic- 
candis : April 1860. No. 176. Etiam in graminosis paludosis juxta 
rivulum de Lopollo : April 1860. No. 180- 
Var. africana W. et G. S. West in Journ. Bot. 1897, p. 270. 
Huilla. — Terrestris, cum Porphyrosiphone Notarisii, in pascuis pluv. 
autumnalibus frequentius inundatis, demum exsiccantibus, ad lacum 
magnum de Ivantala : March I860. No. 18. 
6. S. natans W. et G. S. West in Journ. Bot. 1897, p. 270. 
Huilla. — Inter Microsporam Lofgrenii, etc., in uliginosis editioribus 
prope Humpata, Empalanca et Lopollo ; plagas spongiosas unacum 
Eriocauloneis, Xyridibus et Utriculariis constituens ; May I860. 
No. 15. Morro de Lopollo; May 1860. No. 182. Etiam in grami- 
nosis paludosis juxta rivulum de Lopollo ; April 1860. No. 180- 
The nearest species to this is S. purpurascem (Kiitz.) Gomont, I.e. 
320-1, t. 9, f. 6-8, from which it is distinguished by the much fewer 
branches of its more elongate filaments, its differently coloured sheaths 
which are much more attenuate at the apices (not acuminate), its 
less numerous and more elongate trichomes not constricted at the 
