•368 xv. rivulariace.e (West). [Dichothrix 
PuNGO A.NDONGO.— Inter Scytonema Myochrous var.chorographicum, 
in rupih. perpendic. ad latera boreal, et occid. de Pedra Songue ; 
April 1857. No. 12. Inter Scytonema cincinnatum var. cethiopicum, in 
pascuis spongiosis breviter graminosis juxta rupes gig. Prajsidii prope 
Catete ; May 1857. No. 111. 
3. GLffiOTRICHIA J. Ag. (1842). 
1. G. aethiopica W. et G. S. West in Journ. Bot, 1897, p. 240. 
MOSSAMEDES. — Satis freq. inter Chara? speciem in rivo Caroca vel 
Croque prope Cabo negro ; Sept. 1859. Nos. 19 and 173. 
This species differs from G. natana (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 primary 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, 
pL 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 ; May 1860. No. 15. In grami- 
nosis paludosis juxta rivulum Lopollo ; April 18G0. 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 Schizotrichemfuscescentem, in paludibus exsiccandis ; 
April 1860. No. 176. Etiam inter Utricularium, Morro de Lopollo : 
April 1860. No. 179. 
This has a very distinct facies from //. litteolw*, 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 o"blong, 1^-3 times longer 
than broad. 
Huilla. — In cosspitibus parvis intricatis inter //. luteolum, in uligi- 
