216 Morphologie und Teratologie. 



5. Two distinct floral types — that are connected by 

 transition forms — are observed, viz., the chasmogamic and 

 the cleistogamic. Of these the cleistogamic is the commoner, 

 and may alone occur on many plants. 



6. Flowers of each type are coniined to distinct areas of 

 a plant. Chasmogamic flowers do not extend to the termi- 

 nation of branches, but beyond them are cleistogamic ones. 

 (Gray, also B ritten and Brown, leave it tobe inferred that 

 chasmogamic flowers are in the uppermost part.) 



7. Chasmogamic flowers are equally numerous on plants 

 growing in shade as in sunshine. A small percentage of them 

 produces good capsules; not all are sterile as indicated in bo- 

 tanical works. 



8. The chasmogamic type of flower is the more primitive, 

 the cleistogamic has been evolved from it by gradual modi- 

 fication of all its parts. 



9. On the aerial parts stomata are abundant and wide- 

 spread. 



10. Bicollaterai bundles are here frequent and well devel- 

 oped, while as in other parasites that have been described, the 

 xylem is relatively small, the phloem relatively large in amount. 



11. Complicated and anastomosing bicollaterai vascular 

 bundles occur likewise in the tuber. 



12. The so-called „grapplers" arise endogenously, and are 

 true roots, though by degeneration the root-cap has been lost, 

 hl structure they show degenerate histological peculiarities. 



13. Histologically it is shown that the cleistogamic flowers 

 are physiologically but not morphologically cleistogamic. They 

 retain a fairly well-developed nectary that probably represents 

 a fifth stamen. 



14. The microspore follows the type of development com- 

 mon to angiosperms, but the mature grain shows division into 

 two distinct nucleated protoplasmic masses. 



15. The macrospore deveiops normaily, but the endosperm 

 nucleus produces a precocious endosperm, as in other related 

 parasites, that grows up round the egg cell. 



16. The developing embryo shows no trace of cotyledons. 



17. The parasiiic relation is established from the beechroot, 

 rather than from Eplpliegiis, and is early shown as an invading 

 ramifying tissue composed of large richly protoplasmic cells 

 and tracheids, that eventualiy establish a highiy complicated 

 relation in the mature tuber of Epiphegus. J. M. Macfarlane. 



Gerschon, Seliber, Variationen von Jiissieua repens mit 

 besonderer Berücksichtigung des bei der Wasser- 

 form vorkommenden Aerenchyms. (Dissertation. 

 Halle 1905. 4». 54 pp.) 



Verf. berichtet in der vorliegenden Arbeit über Versuche, 



die Abhängigkeit der morphologischen und anatomischen Aus- 



