UG 



MORPHOLOGY OF SPERMATOPIIYTES 



strol>ili,' liowovcr, arc the most interesting of Wieland's results 

 tlms far. Tlie staniinate strolnli originally described* were 

 taken from specimens of Cycadeoidea iiigens, and ai>i)arently 

 reseniLle the ovulate stroliili of the group in all important fea- 

 tures. Each strobilus is borne 

 terndnally upon an axillary 

 dwarf shoot, and is ensheathed 

 by a cluster of bracts. There 

 is plain indication of the ex- 

 istence (if a thick central axis 

 upon which the numerous 

 sp(n'ophylls wei'c crowiled, 

 each sporophyll bearing nu- 

 nicrou.s sori. This first mea- 

 ger (lcscri]ition of a staniinate 

 strobilus has been supple- 

 mented liy later preparations 

 (if AVi(Tan(l from the strobili of 

 the remarkable t'yradeoidca 

 Dacotensls.'' With great gen- 

 „ , ., ^ . „ erositv Dr. AVieland has idaced 



iiG. 101. — Ci/cadeoi:/en Daeotcnsis, li small • 



part of a raJiai oblique section of astro- tlicse recent preparations at 



bilus, showing some of the numerous our disposal, and from tllClll the 

 synangia, x 8. — From preparation made x n ■ j- ' '4-^- ,-. . 



1. .^ T. TT- / ■ ■ following account IS written: 



by G. E. \\ lELAND from specmien in , . . 



Vale University Museum. The strobiluS of i'lJCildcnl- 



deu DdCdii'iisix is cif the usual 



ovoid form, being completely ensheathed by overlapping sterile 



bracts. Just within the ensheathing bracts there is a set (if very 



prominent inicrosporophylls, whose abaxial surfaces are densely 



covered by well-defined sori (Fig. lOll. As is evident from the 



figure, and much more conspicuously so in other preparations, 



the sori occur (doS(dy packed together in well-defined liiu's. The 



section of a sorus reveals characters unknown lu>retofoi\' aiming 



Gymnosperms, and remarkably similar to those of Alarattiaceae 



(Fig. ]0L'). 'Idle structure seems to be almost identical with 



that of the syiiangiiim oi Mundlui or of Dmuicii, and ]U'eseiits 



more the a]i])earaiice of a ]iliu'ilocular siKirangium than of a 



sorus. Superficially there is a wall of heavy cells, and between 



it and the regular sporaugial chambers ther(> is a more delicate 



tissue. The sporaugial (diamln'rs, st'parated from one another 



