1905] CARDIFF—SPORANGIUM IN BOTRYCHIUM 347 
12. Amitotic division and increase in size of nuclei are both 
devices for rapidly increasing nuclear surface, thus effecting a larger 
increase of metabolic products. 
I am indebted to Professor Joun M. Courter and Dr. CHARLES 
J. CHAMBERLAIN for criticism and advice. 
CoLumBra UNIvERsIry. 
LITERATURE CITED. 
1. Bower, F. O. Studies in the morphology of spore-producing members. II. 
P. 37. 1896. 
- CAMPBELL, D. H., Mosses and ferns 250. 1895. 
3. Can, C., Uber he Bedeutung der direkten Zelltheilung. Sitzb. Schr. Physik- 
Okon. Ges. Kénigsberg. 1890 
4. Fremuine, W., Entwicklung und porte der Kenntnisse iiber Amitose. Merkel 
und Bonnet’s Ergebnisse. IT. 
- GoEBEL, K. , Beitrige zur rE Entwickelungsgeschichte der Sporan- 
jen Jot. Zeit. 38:545. 1880. 
; Hortzman, C. L., On the apical growth of the stem and the eea RS of 
— nj Botrychium virginianum. Bot. GAZETTE 1'7:21 
7. NATHANSO Physiologische Untersuchungen tiber cies Kern- 
hctane. pu b. Wiss. Bot. 35: 48-79. 1900. 
PFEFFER, W., Ueber die Erzeugung und die Stee cab Bedeutung der 
Amitose. Verhandl. Kénigl. Siichs Akad. Wiss. 53:4-12. 1899. 
9. Witson, E. B., The cell in development and inheritance 391. 1902. 
EXPLANATION OF PLATE Ix 
All figures were made — Zeiss nia - oculars and Bausch Lomb 
camera lucida. The origina half in reproduction. 
IG. 1. Young spovangiam. x (en: 
IG. 2. Sporogenous tissue of thirty-two cells; gas two cells thick and 
visions taking place both periclinally and anticlinally. % goo. 
G. 3. Sporogenous tissue in mother-cell stage showing comes’ in cell 
rangement the two original walls, a and 6, beginning to separate. X 400. 
lata showing sporogenous tissue separating re “blocks along 
me pee walls. X 150. 
Fic. . Portion e fig. 4; mother-cells in synapsis; commencement of tapetal 
X goo. 
tS 
a MK 
9 
gtowth. 
Fic. 6. Sporangium showing sporogenous tissue separating along original 
ood shown i in fig. 2; plates of tapetum extending between earlier formed blocks. 
7 7. Sporangium showing cosine tissue separated into blocks in 
each of which the cell division is simultaneo 
Fic. 8. Portion of sporangium showing ane : the forming tetrads, 
also the large increase in the number of tapetal nuclei. ; 
Fic. 9. Later stage than shown in fig. 8. X goo. 
