Morphologie und Teratologie. 323 



elements, which he calls mlcrochloroplastids, and which are 

 rod-shaped. Some account of the structure and function of the 

 water-absorbing hairs of the leaves and of the stomata is given. 

 The general anatomy of stem and leaf presents no features of 

 special interest. E. C. Jeffrey. 



Campbell, Douglas H., The a f f i n i t i e s o f t h e Ophioglossaceae 



and Marsiliaceae. (American Naturahst. XXXVIII. October 



1904. p. 701—775. fs. 1—9.) 



The author considers that from a comparison of the embryo 



and reproductive organs as well as from the mode of growth 



of the gametophyte, the conclusion must be reached that the 



Ophioglossaceae and Marattiaceae are somewhat closely allied. 



Further in his opinion there is no valid reason for removing 



the Ophioglossaceae from their association with the Filicales. 



The author also concludes from a study of the mode of 



development of the sporangium and sorus and particularly from 



the structure of the mature sporangium in the Schizeaceae and 



Marsileaceae that the tvvo groups are somewhat closely united 



by bonds of affinity. E. C. Jeffrey. 



Cardiff, Ira D., Development of the Sporangium in 

 Botrychiiim. (Botanical Gazette. XXXIX. May 1905. p. 340 

 —346. 1 pl.) 



The authors investigation was carried on Botrychiiim 

 virginiaimm and B. ternatiim. The sporogenous tissue originates 

 from a Single hypodermal cell^ and as successive sporogenous 

 cells are formecl, each retains its individuality, giving rise to a 

 ■distinct block of sporemother-cells. Divisions are simultaneous 

 in each block of sporogenous cells, although different blocks 

 Vary among themselves. All sporemother-cells produce spores 

 and the tapetum is not of archesporial origin. When the 

 groups of mother cells separate, the tapetum grows in between 

 them, without however giving rise to cell walls. 



E. C. Jeffrey. 



Lloyd, F. E., The pollen tube in the Ciiciirbitaceae and 

 Riibiaceae. (Torreya. IV. June 1904. p. 86—91.) 



From his own observations on the Rublaceae and Longo's 

 on the Ciiciirbitaceae^ the author reaches the following con- 

 clusions. The arrangement and direction of elongation of the 

 cells in the conducting tissue has no influence on the path of 

 the pollen tubes, which appears to be entirely controlled by 

 chemiotactic influences. The movement of the pollen -tube 

 endotropically through the tissues or ectotropically through 

 air Spaces has not the phylogenetic value attached to it by 

 Treub and Nawaschin, but has purely a physiological 



significance. E. C. Jeffrey. 



21* 



