THURSTON: SEX IN THE CONJUGATAE 
Zygnema aries (Wolle) Spirogyra pth (Peti t) 
leiospermum (Cooke) Juergensti re? 
s pit hardener (Wittrock) ae plain (Cooke) 
“ purpureum (Wolle) ty Lagerheimii (Wittrock) 
ef rhynchonema (West) S. laxa tit 
de eum (West) <4 longata (Fritsch) 
St stellinum (Wolle) ~ lutetiana (Wolle) 
a Vaucherit (Cooke) ue olle) 
Spirogyra —— (Wolle) Re 3 
Fritsch) = Pi pesto (Transeau) 
i angolensis (West) = neglecta (Pe 
ss (Wes ie itida (C 
a bellis (Petit) as orbicularis (Cooke) 
z Borgeana (Transeau) “s orthospira (Wolle 
te calospora (Wolle) a parvispora (Wolle) 
i catenaeformis (Petit) y porticalis ie 
Ys condensata olle) z phone a- (Wolle) 
e cr olle) os quadrata (Petit) 
iy cylindros por. re quinina (Cooke 
my daedalea (Transeau) " rectangularis (Transeau) 
; decimina (Petit x eflexa (Tra 
a) dil d) as rivularis (Wolle) 
= dubia (Wolle) iy setiformis (Wolle) 
3 ellipsospora (Transeau) a serratum (Hassall) 
ny Farlowii (Transeau) = Spreeiana (Petit) 
Sflavescens (Wolle) pte subaequa (Wolle) 
c Sluviatilis (Wolle) s subsalsa (Wolle) 
fuscoatra (Wolle) “ (Transeau) 
es gallica (Petit) Ne tenuissima (Petit) 
2 graci Ile) s ternata (Petit) 
as Grevilleana (Petit) varians (Wolle) 
" Hantzschii (Wolle) . lata (Wi 
es Hassallii (West) ion Weberi (Petit) 
of hydrodictya (Transeau) ay Welwitschii (West) 
rr tllinoiensis (Transeau) Plagiospermum tenue (Wolle) 
es inflata (Cunningham) Sirogonium stricta (Wolle) 
TABLE II 
CONJUGATION SCALARIFORM, SPORE IN THE CONJUGATION TUBE 
Zygnema Collinsianum (Transeau) Mougeoiia date (Wolle) 
i parvulum (Wolle) cillima (Wittrock) 
«f pectinatum (Wolle) - haere (West) 
1 Ralfsit Wolle) i laetevirens (West) 
Zygogonium psa (Wolle) bs laevis (Cooke) 
ardhit (Wolle) minnesotensis (Wolle) 
s © sh aes (Wolle) numuloides (Wolle) 
zs ericetorum (Cooke) : parvula (Wolle) 
Ate (Cooke) “t pulchella (Wittrock) 
ie yynchonema (West) i quadrata (West) 
As Saeare (Wolle) se sphaerocarpa (Wolle) 
Mougeotia angolensis (West) ds tenuis (Wittrock) 
‘0 : ' tumidula (Transeau) 
% alcarea (Wittrock) he S a (West) 
iy ca est) ~ verrucosa (Wolle) 
ne delicatula (Wolle) is (Wittrock) 
o divaricata (Wolle) Mesocaras crass: 
us (Wolle) 
“ genuflexa (Collins) aiis (Cooke) 
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