638 MOSSES AND FERNS 



P. 453. The extensive but interrupted marginal meristem noted 

 by Kashyap in E. debile, is probably the result of the repeated dichot- 

 omy of the primary apex. E. debile has but a single neck canal-cell. 



P. 454. Jeffrey's conclusions as to the origin of the root in the 

 embryo of E. hiemale and E. limosum are interesting, as they indicate 

 a resemblance to the Eusporangiate Ferns, especially Ophioglossum 

 and the Marattiales. 



P. 457. E. debile agrees closely with E. hiemale in the early develop- 

 ment of the young sporophyte. 



P. 459. For more recent investigations in the stem structure of 

 Equisetum see Fames (i), Sykes (i), Plant (i), Campbell (27). 



P. 462. The development of the xylem in Equisetum has been 

 carefully examined by Fames (i). 



P. 462. Miss Sykes (i) has described the presence of very large 

 reticulately pitted tracheids at the nodes in E. maximum. These 

 extend into the carinal canal of the internodal bundles, and it is 

 thought that their function is to conduct water from one internodal 

 bundle to another, as the carinal canals are interrupted at the nodes. 



P. 464. The lacuna in the vascular bundle is known as the carinal 

 canal. 



P. 467. The most elaborate study of the tissues of Equisetum, 

 recently published, has been made by Plant (i). 



P. 472. For Bower (15), read (14). 



P. 476. Fig. 240 should be 279. 



P. 478. Beer (3) states that the "middle layer" is formed through 

 the activity of the ta petal plasmodium. The membrane first formed 

 about the young spore is the exospore within which is later formed the 

 endospore. The middle layer is first deposited by the tapetal proto- 

 plasm, and later, outside of it is formed the perinium, from which, 

 by splitting, the elaters arise. 



P. 482. For a further discussion of the relationships of the Equise- 

 tales, see Campbell (27). 



CHAPTER XIII 



P. 483. For Goebel (18), read (10) ; for Bruchmann (5), read (4). 



P. 483. Bruchmann (9) has succeeded in germinating the spores of 

 several European species of Lycopodium. See also Chamberlain (3), 

 Holla way (2). 



P. 485. It seems probable, from the more recent studies on the 

 Psilotaceae, that the family should be made the type of a distinct 



