-368 XV. RivuLARiACE^ (West). [^Dichothrix 



PuNGO Andongo. — Inter Scylonema Myochrous var. chorographicum, 

 in rupib. perpendic. ad latera boreal, et occid. de Pedra Songue ; 

 April 1857. No. 12. Inter Scytonona cincimiatum var. (fthiopicuin, in 

 pascuis spongiosis breviter graminosis juxta rupes gig. Pr£esidii prope 

 €atete ; May 1857. No. 111. 



3. GL(EOTRICHIA J. Ag. (1842). 



1. G. aethiopiea W. et G. S. West in Journ. Bot. 1897, p. 240. 



MossAMEDES. — Satis freq. inter Chares speciem in rivo Caroca vel 

 Croque prope Cabo negro ; Sept. 1859. Nos. 19 and 173. 



This species differs from G. 7iatans (Hedwig) Rabenh. Deutschl 

 Kryptog.-Flora, 90 (1847), in the length of its cells and in its spores. 



XVI. SIROSIPHONIACE^. 

 1. HAPALOSIPHON Nag. (1849). 

 In this genus the spores are produced from the ordinary vege- 

 tative cells of certain of the plants. They are formed from the 

 majority of (or even all) the cells of both the pi'imary filaments 

 and branches of some portions of these plants, and have always 

 thick yellowish-brown cell-walls. The outward form of the spores 

 varies with the different species, the dimensions being about those 

 of the vegetative cells. (Cf. also Hansgirg in Oesterreich. Bot. 

 Zeitschr. xxxiv. 393 (1884); West in Journ. Linn. Soc. xxx. 272, 

 pi, XV. f. 23-28.) In most of the species the branches arise at 

 right angles to the main filament, and the cell of the main fila- 

 ment directly under the branch projects slightly into the sheath 

 of the latter. 



1. H. luteolus W. et G. S. West in Journ. Bot. 1897, p. 241. 

 HuiLLA. — Inter alias algas, in uliginosis editioribus prope Humpata, 



Empalanca et Lopollo, plagas spongiosas unacum Eriocauloneis, 

 Xyridibus et Utriculariis constituens ; Slay 1860. No. 15. In grami- 

 nosis paludosis juxta rivulum Lopollo ; April 1860. No. 180. Etiam 

 Morro de Lopollo ; May 1860. No. 182. 



This species occurs in minute tufts, and the great resemblance to 

 each other of the primary filaments and branches, together with their 

 thick yellowish sheaths, characterise it. 



2. H. aureus W. et G. S. West in Journ. Bot. 1897, p. 241. 

 HuiLLA. — Inter Schizotr/chem. fusceficentcm, in paludibus exsiccandis ; 



April 1860. No. 176. Etiam inter Utricularhiin, Morro de Lopollo : 

 April 1860. No. 179. 



This has a very distinct facies from H. lyfeolus, being of a bright 

 golden brown colour, with more tortuose filaments, the sheaths of 

 which have a very different appearance ; the cells also are much 

 more variable (and usually longer), the branches are more numerous 

 and of a thickness different from that of the primary filaments, and 

 often arise in pairs. 



3. H. intricatus West in Journ. Linn. Soc. xxx. 271-2, pi. xv. 

 f. 16-28 (1894) ; W. et G. S. West in Journ. Bot. 1897, p. 242. 



An aquatic form ; spores rectangular oblong, 1^-3 times longer 

 than broad. 



HuiLLA. — In caespitibus parvis intricatis inter H. luteolum, in uligi- 



