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1907] BVRLINGAME—SPORANGIUM OF OPHIOGLOSSALES 53 



O phio glo s sum Helminthostachys Botrychium 



m 



16. Wall formed or not Special tetrad wall in- No wall formed. 



■ 



I after first maiotic di\'ision. closes each spore in a 



17. Tetrads for a long separate compartment. Tetrad inclosed within 

 time inclosed within per- persistent wall of mother 



sistent mother-cell wall 



cell. 



The features common to the genera are: (i) the breaking-down of 

 the inner layers of the wall, (2) the penetration of a plasmodium, 

 derived from the tapetal cells, among the sporogenous cells, (3) the 

 failure of the mother cells to contribute to the tapetal plasmodium, 



(4) the formation of a resting nucleus after the first maiotic division, 



(5) the appearance in the spore-plasm of a phase of decreasing density 

 followed by one of increasing density, the former possibly connected - 

 with the rapid growth of the young spore coat (no data from Botrych- 

 ium), (6) the spores rich in starch, (7) the tetrads in vacuoles of the 

 Plasmodium. 



This investigation was carried on under the direction of Professor 

 John M. Coulter and Professor Charles J. Chamberlain, 



The University of Chicago 



LITERATURE CITED 



Allen, C. E., Die Kcimung der Zygote bei Coleochaete. Ber. Deutsch. Bot. 



Gesells. 23:285. 1905, 

 Beer, Rudolph, On the development of the spores of Helminthostachys zey- 

 lanica. Annals of Botany 20:177. 1906. 

 ^ ^ , The present position of cell-wall research. New Phjlol. 3: 159. 1904. 



Bowt:r, F. O., Studies in the morphology of the spore-producing members. II. 



Ophioglossaceae. London. 1896. 

 Campbell, D. H., Mosses and Ferns. 1905. 

 f Cardiff, Ira D., Development of the sporangium in Botrychium. Box. Gazette 



39:340. 1905. 

 DeBary, a., Ueber die Fruchtentwicklung der Ascomyceten. Leipzig. 1863. 

 Fitting, Hans, Bau und Entwickelungsgeschichte der Macrosporen von Isoetes 



und Selaginella und ihre Bedeutung fiir die Kenntniss des Wachstums pflanz- 



licher Membranen. Bot. Zeit. 58: 107, 1900. 



Goebel, K., Beitrage zur vergleichenden Entwickelungsgeschichte der Spo- 

 rangium. Bot. Zeit. 38:545. 1880; ibtd, 39:681. 1881. 



HoLTZMAN, C. L., On the apical growth of the stem and the development of the 

 sporangium of Botrychium virginianum. Bot. Gazette 17:214. 1892. 



