Hapaloaiphon] \\i. sikosiphoniacka (^ 
ooaia editioribus, prope Bnmpata, Empalanca et Lopollo ; Mai 
No. 15. 
I. H. Welwitschii W. et <:. 8. \W-i InJourn. Bot. 1897^ | 
Pdngo Andongo. —Intel- Batrachospermum gracillimum in rii 
Tangue ips. Praasidii; May 1867, No. 3. 
This species may be compared with //. hibernicm W, et G S. W< b1 
(in Journ. \l. M. S. 1896, 163), from which it differs in th< 
cells of the primary filaments ; in baring much Eewer branches, which 
are also Bhorter and Dot Bexuosc ; moreover, the cells of the branches, 
as well as the heterooysts, never attain the length of thoat i i 
//. hibernicu8. Compare also with //. intricatus West. 
•_'. STIGONEMA Ag. (1824). 
The e> lis of this genus are protoplasmically continuous through- 
out the whole plant, a tine -tran<l of protoplasm, passing from 
cell to cell along the middle of the filament, effecting this con- 
tinuity. This is best seen in plants thai have been dried and 
soaked out, the cells then appearing like beads on a string. These 
connect ing I breads are not visible in living plants, but in becoming 
dry the protoplasm shrinks away from the minute canal along 
which it passes through the septa, and on soaking again doe- nol 
reattain its natural position. 
1. S. ocellatum Thur. in Ann. Sc. Nat. 6 ( ser. Bot. L. 380 
(I S7f)): W.et G. B. West in Journ. Bot. L897, p. 243. 
Conferva ocellata Dillw. Brit. Conferv. 60 I, Supp. pLD 
Sirosiphon ocettatus E£iitz. Spec. Algar. ol7 (1849) ; Tab. Phyc. ii. 
(1850-2), II. t. 37, f. ii. 
PONGO ANDONGO. — A small form: in small quantity amongst 
Zygnema sp., growing on tufts of Scytonema Afyoehrous var. choro- 
graphicum, on rocks on the northern and western sides of Pedra 
Songue : April 1867. No. 153. 
Forma major W. et <■. S. West in Journ. Bot. 1897, p. 243. 
A large and finely developed aquatic form. 
Huilla. — Inter Utriculariam, Mono de Lopollo ; April I860. No 
179- In paludibus exriccandis ; April I860. No. 176. 
2. S. flexuosum \Y. et G. S. West in Journ. Bot. 1897, p. 243. 
Huilla. — -Inter ffapalosiphonem luteolum et Microspc 
etc., in uliginosis editioribus prope Hnmpata, Empalanca et Lopollo, 
plagas Bpongiosas unacum EriocauloneiB, Kyridibus, et Qtricnlariis 
const miens : .May i860. Xo. 15. Imam Biorro de Lopollo; .M;i\ 
I860. No. 182. 
This is distinguished from S. panniforme (Ag.) Born, et 1'Iah. by its 
hahit, its very different branching, its almost colourless Bheath with 
smooth exterior, and by the round apices of the branches, as well as 
by its somewhat smaller size. 
3. S. minutum Has-. Brit. Freshw. Alg. i. 230; ii. t. lwii. f. 3, 
•1- (1845): Born, el Flah. in Ann. Sci Nat. 7 aerie, Bot 
72 7! (1887); W. et G. S. West in Journ. Bot. 1897, p. 243. 
Scytonema minutum Ag. Synop. Algar. Scandin. 117 (1817). 
Mmm \. [n graminoais paludibus juxta rivulnm de Lopollo ; April 
I860. No. 180. 
