WELWITSCH's AFRICAN FRESHWATER ALG^. 269 



1 . C amptothrix, gen . n . 



Plantse minutfe, filamentosse et epipbyticas ; fila brevissima, 

 baud ramosa, e serie singula cenularum irregulariim formata, 

 supra algas majores aquaticas repentia, irregulariter flexuosa et 

 submoniliformia, vaginata ; vagma debcata, arcta et byabna ; cel- 

 lulee subglobosffi, rotundo-quadratre vel subrectangdares, apicem 

 versus filorum minores, prope apicem filorum vaginis indistinctis 

 vel destitutis ; protoplasma pallide ferugineum et bomogeneum. 



1. C. repens, sp.unica. Cbaracter idem ac generis. Crass. 

 fil. 3-8-5-8 /x. 



Huilla. Epipbytica supra Schizotrichem natantcm et Microcolewn 

 sociatiim, in uliginosis editioribns prope Humpata, Empalanca et 

 Lopollo, plagas spongiosas unacum Eriocauloneis, Xyridibus et 

 Utriculariis constituens ; May 18G0. No. 15. 



Tbe diverse forms of tbe cells and tbeir irregular disposition in 

 tbe sbort tapering filaments give a cbaracter to tbis genus not 

 possessed by any otber of tbe genera of eitber tbe Varjinariecc or tbe 

 LynghijecB, and necessitate tbe plant being placed as tbe type of a 

 new order [Cam plot nchccc) of llormofjonecc Humoct/stece. 



XX. — Vaginarie^. 

 1. ScmzoTHRix Kiltz. (1843). 



1. S. elongata, sp. n. S. libere natans, calce non incrustata 

 et non in strato distincto; fibs angustissimis et lougitudine maximi, 

 flexuosis et ad intervalla longa bifurcatis ; vaginis firmis subarctis, 

 cylindricis, byalinis et acbrois, marginibus parallelis et leviter 

 asperis, valde attenuatis ad apicem longum criuiformem ; tricbo- 

 matibus liete a^ruginosis, 1-3 intra vaginam, parallelis vel sub- 

 torulosis, ad dissepimenta non constrictis ; cellulis diametro 4-8-plo 

 longioribus, dissepimentis plerumque indistinctis ; parte apicali 

 tricbomatis attenuata. Crass, fil. 7"5-13 // ; crass, tricb. l-2~l-5 fi. 



Huilla. Inter Hapalosiplnmem lutcnlum et Microsporam Ldfi/miii, 

 Sec, in uliginosis editioribus prope Humpata, Empalanca et Lopollo ; 

 May 1860. No. 15. 



Tbis differs from tbe otber allied species in several notewortby 

 features, sucb as tbe extremely long flexuose attenuate filaments 

 witb few brancbes, tbe long cells, and tbe somewbat close cylindrical 

 sbeatb. 



2. S. delicatissima, sp.n. S. terrestris; fills minutis, brevis- 

 simis, tortuosis et intcrdum ramosis ; vaginis subamplis et firmis, 

 marginibus glabris vel irregulariter undulatis, byalinis, subbomo- 

 geneis, apicibus subobtusis vel sicpius longissime attenuatis; tricbo- 

 matibus la)te a;rugineis, 1-2 intra vaginam, parallelis vel leviter 

 torulosis, ad dissepimenta constrictis ; cellulis diametro 6-8-plo 

 longioribus, protoplasmate bomogeneo ; cellula apicali acute conica. 

 Long. tot. fil. 100-100 /x; crass, fil. 5-6-5 pr, crass, tricb. 0-6-0-8/x. 



Pungo Andongo. Cum TuJijpotricJie arenophila, ad terram arenoso- 

 humosam in editissimis rupibus Pedra Cazella; Jan. 1857. No. 151. 



Tbis species is very easily overlooked on accouut of its minute 

 size and delicacy. 



