1904] GARBER: RICCIOCA RPUS NATANS 175 
7. The first division of the sporophyte is transverse or oblique, 
The early subsequent divisions are irregular. 
8. A large quantity of nutritive material is excreted into the 
capsule among the mother-cells. 
9. There is no indication of elaters or sporophyte foot of any 
kind, which fact is associated with the aquatic habitat. 
10. The fruiting period occurs in spring and occupies about 
ten weeks. 
11. The gametophyte number of chromosomes is four, the 
sporophyte number eight. 
12. Permanency of the water appears to be unfavorable to 
sexual reproduction. 
13. Plants once established on the soil are usually unable to 
resume the floating condition, but under exceptional circum- 
tances they may do so. 
14. Vegetative plants hibernate at the bottom of the pond, 
producing new plants the following spring. 
15. Rhizoids do not replace ventral plates, but are an addition 
to adapt the plant toa life on the soil. 
16. The apical region is exceedingly plastic. 
17. The sporophytes are frequently invaded and destroyed by 
a fungus belonging to the Ustilagineae. 
LITERATURE CITED, 
- HOFMEISTER, WILHELM, On the higher Cryptogamia. Ray Society, 
1862. 
al 
» 
Kwny, L., Ueber Bau und perigee: der Riccien. Jahrb. Wiss. Bot. 
5: 364-386. Als. g¢-46. 
. STRASBURGER, E., Die Gost lecasesahe und die Befruchting bei M/ar- 
chantia polymorpha. Jahrb. Wiss. Bot. 7: 409-422. pls. 27-28. 1869. 
. FARMER, J. B., Studies in Hepaticae. Annals of Botany 8: 35-52. pis. 
6-7. 1894 
- FARMER, J. B., and REEVES, JESSE, On the occurrence of centrospheres 
in Pellia epiphylla Nees. Annals of Botany 8: 219-224. p/. 74. 1894. 
. LEITGEB, H., Untersuchungen iiber die Lebermoose 4: 1879. 
CAMPBELL, D. H., Mosses and Ferns. 1895. 
Davis, B. M., Nuclear studies in Pellia. Annals of Botany 15: 147-180. 
bls. 10-17, 1901. 
- Krucu, O., Appunti sullo sviluppo degli organi sessuali e sulla feconda- 
zione della Rie//a Clausonis Let. Malpighia 4: 403-423. f/s. 17, 78. 
1890, 
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