374 XX. VAGiNARiE^ (West), [Schizothrix 



XX. VAGINARIEiE. 



1. SCHIZOTHRIX Kutz. (1843). 



1. S. elongata W. et G. S. West in Journ. Bot. 1897, p. 269. 

 HuiLLA. — Inter Hapahisiphonern Inteohim et JllcrosjxDdm LUfgrenii, 



etc., in uliginosis editioribus prope Humpata, Empalanca et LopoUo : 

 May 1860. 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 Tolypotrklie arenophila^ ad terram arenoso- 



humosam in editissimis rupibus Prsesidii, 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" 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 Xyridearum in editis 

 de Morro de LopoUo obducens ; Feb. 1860. No. 192. 



4. S. thelephoroides Gomont, I.e., 319, 320, t. 10, f. 1-4 (1892) ; 

 W. 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, ^.c, 

 324-5, t. 11, f. 4-6 (1892) ; W. et G. S. West, I.e. 



HuiLLA. — Freq. apud Hapalosiphoneiu aureum, in paludibus exsic- 

 candis ; April 1860. No. 176. Etiam in graminosis paludosis juxta 

 rivulum de LopoUo ; April 1860. No. 180. 



Var. africana W. et G. S. West in Journ. Bot. 1897, p. 270. 



HuiLLA. — Terrestris, cum Porphyrosiphove Noiari.^ti, in pascuis pluv. 

 autumnalibus frequentius inundatis, demum exsiccantibus, ad lacum 

 magnum de Ivantala ; March 1860. No. 18. 



6. S. natans W. et G. S. West in Journ. Bot. 1897, p. 270. 

 HuiLLA. — Inter MicroKporam Lqfgrenii, etc., in uliginosis editioribus 



prope Humpata, Empalanca et LopoUo ; plagas spongiosas unacum 

 Eriocauloneis, Xyridibus et Utriculariis constituens ; May 1860. 

 No. 15. Morro de LopoUo ; May 1860. No. 182. Etiam in grami- 

 nosis paludosis juxta rivulum de LopoUo ; April 1860. No. 180. 



The nearest species to this is S. pnyjrurascoin (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 elonsrate trichomes not constricted at the 



