THE HIGHER CRTPTOGAMIA. 399 



the mother-cells of the spermatozoa of Selaginella helvetica. 

 I have not yet found spermatozoa inside these vesicles. De 

 Bary has lately discovered (' Berichte der naturf. Gesellsch. 

 zu Freiburg/ 1858, p. 467), that the spores of Lycopo- 

 dium inundatum produce a body composed of a few cells, 

 whose structure is not unlike that of the archegonium of a 

 fern. It is probable from these observations that the 

 similarly formed spores of Lycopodium, Psilotum, &c, are 

 of different sexes, and as in Equisetum arvense produce 

 partly archegonia and partly spermatozoa. 



Of late years the Lycopocliacese have received less atten- 

 tion from vegetable anatomists than any other of the 

 higher cryptogams. Since the appearance of those parts 

 of BischofPs ' Cryptogamische Gewachse,' which relate to 

 these plants, few papers on the subject have been pub- 

 lished. Karl Midler's observations (which however are full 

 of errors), are to be found in the s Botanisohe Zeitung' for 

 1846, besides which we have Nageli's work cited above, and 

 Mettenius's history of the origin of the embryo of S. invol- 

 vens. Spring's monograph is devoted principally to the 

 Hmitation of the species. 



