116 SIPHOPHYCE®. 
Consult Thuret in ‘‘ Annalesdes Sciences Naturelles, Botanique,” 1843. 
Walz in Pringsheim’s “Jahrbucher” for 1866. Braun ‘ Rejuvenescence,” 
pp. 128, 140, and following. 
GEeNUs 53, VAUCHERIA. D.C. (1805.) 
Characters the same as given above for the Family. 
Two or three arrangements of the European species of Vaucheria have 
been proposed, differing slightly in detail. The following is that of Pro- 
fessor Nordstedt :— 
VAUCHERIA, 
A. Antheridia not separated from the thallus by a short empty 
boundary cell. 
a TUBULIGER®. Antheridia little or scarcely bent, oblong 
cylindrical, or lanceolate, with an opening at the top. Red 
pigment bodies not collected in the middle of the mature 
oospore, Oogonia and antheridia almost stemless. 
* Oogonia nearly round. 
1 V. dichotoma (L) Diecious. 
2 V. ThuretiiWor. Monecious. 
** QOogonia not round, more or less oval, 
frequently rather oblique. 
3. V. aversa, Hass, 
4. V. sericea, Lyngb. 
b CoRNICULAT. Antheridia bent in the form of a horn, ora 
hook, placed on the short and bent side branches of the 
thallus. Brown pigment in the middle of the mature 
oospores. 
aa Sessiles. Oogonia sessile (or with exceeding short 
stems) beside the antheridia on the thallus. 
5. V. Dillwynm, Ag. 
6. V. sessilis (Vauch). 
bb =Racemose. Antheridia at the end of a fruit branch, 
which, somewhat lower down, carries the 
oogonium. 
* Oogonia turned upwards. 
+ Antheridia and oogonia bending in op- 
posed planes, forming an angle with 
one another. When the oospores 
fall they are surrounded by the 
oogonium membrane, which is not 
changed to slime. 
7. V. geminata, Walz. 
8. V. hamata, Walz. 
tt Antheridia and oogonia (mostly) 
bending in parallel planes, the 
oogonium membrane turns to slime 
and dissolves. 
9. V. terrestris, Lyngb. 
** Oogonia turned-downwards. 
10, V. uncinata, Kutz. 
ce Antheridia straight, with the top covered, and a pair of fruiting 
tubes standing out at the side. 
11. V. De Baryana, Woron. 
