BEYOPHYTES. 



55 



ones. Sansom appears to have seen a case of division 

 of a flower into two in Polytrichum commune, as the 

 two setge springing from the apex of the stem were 

 each surrounded by a distinct perichsetium. 



Following on these cases of branching of the in- 

 florescence, we meet with a case of " abbreviation." 

 Miano observed in Lunularia vulgaris sessile arche- 

 gonia occurring in pockets of the th alius in which 



7. 



/ 



Fig. 14. — Mnium undulatum. Archegonia (ar) growing laterally on 

 the stem. (After Westerdijk.) 



normally archegoniophores occur, thus approaching 

 the normal condition of Aytonia and Glevea (fig. 13). 

 He also observed archegonia situated laterally on a 

 wart-like excrescence, suggesting the condition of 

 Corsinia ; also on short-stalked archegoniophores, but 

 still included within the pocket. Ekstrand mentions 

 the fusion of female flowers in Nardius hsematosticta. 



Westerdijk mentions a curious case of either re- 

 duction or displacement, probably the latter, in Mnium 

 undulatum, in which he noticed archegonia occurring 

 in a lateral position on the stem ; it was not the result 

 of wounding (fig. 14). 



