FOSSIL VASCULAR CRYPTOGAMS 



127 



passes, and from the margin of which spring the hnear-lanceolate free 

 portions of the leaves. Annularia has been regarded by some writers 

 as an herbaceous aquatic plant ; but there is little doubt that it is the 

 branches and foliage of Calamites. 



The fructification of the Calamariese, described under the name 

 Calamostachys — with which must be identified Volkmannia (Stbg.) and 



Fig. 98. — Leaves o{ C alaniiiina. 

 (After Weiss.) 



tn ft ; IP-^'tSS- \-;.."^ t ^^ 



^ 







4 IP 



I 



( '\ 



Fig. 99. — Archcpocalamites radiatus Stur. 

 (After Stur.) 



Bruckmannia (Stbg.) — has not unfrequently been found in organic con- 

 nection with the stem. Each cylindrical cone-like fructification consists 

 of a number of whorls of sporophylls, but differs from that of Equisetum 

 or of Equisetites in the fertile whorls alternating, in each spike, with 

 barren whorls consisting of a large number of lanceolate acute leaves, 

 free or more or less connate at the base ; the free portions completely 

 covcr the next upper fertile whorl and the base of the barren whorl 



