Sent Se ai Sk) a ha 
1897 | THE LIFE HISTORY OF SALIX 173 
seminal development they become differentiated even at the apex 
and grow from separate initials. 
7. Teratology—In addition to monosporangiate and ambi- 
sporangiate forms, which have been described by other observers, 
-a strange sport of S. petiolaris was found with microsporangia 
growing within the ovary. Sometimes the microsporangia were 
upon long stalks, sometimes upon placentalike outgrowths 
of the carpel, and sometimes imbedded in the carpel wall. 
One case showed two quadrilocular stamens with the filaments 
united below, and the connective prolonged above into a stigma. 
In the microsporangia borne inside the ovaries the microspore 
development was sometimes normal, but was as often feeble and 
abortive. In ovaries which contained microsporangia the ovules 
were sometimes perfectly orthotropous, and had the integument 
developed all around. The macrospore development was normal 
and embryos were not uncommon. Collections, representing 
in some cases three flowering seasons, show that a plant may 
continue its particular sport year after year. 
8. Salix and other Amentifere.—Salix does not have the exten- 
sive archesporial tissue in the ovule described for several Amen- 
tifere, but sometimes has two or three archesporial cells. The 
development of the macrospore agrees more nearly with Betula 
than with any other of the described Amentifere. There are no 
nucellar tracheids as in Castanea and Casuarina. The difficulty 
in finding antipodals in Salix would suggest that the development 
of the macrospore in Casuarina be reinvestigated. 
THE UNIVERSITY OF CHICAGO. 
BIBLIOGRAPHY. 
Seek HOFMEISTER, W: Neuere Beobachtungen iiber ee obildung 
der hc a Pringsheim’s Jahrb. 1: 82-188. 1858. 
1865. SCHACHT, HERMANN: Die Bliithe und Befruchtung von San- 
‘alum album. Pringsheim’s Jahrb. 4: 1-22. 1865. 
3. 1870. HANSTEIN, JOHANNES +. Dae Entwickelung des Keimes der 
Monokotylen und Dikotylen. _ Botan. Abhandl. aus dem Geter der Morph. a 
u. Physiol. EL IS4r2. 1870, : 
