148 SPORANGIOPHORES AND SPOROPHYLLS 
in regular whorls, instead of irregularly as in Zimesspfer’s. In other Spheno- 
phylls the number of sporangia may be less, and the number of the more 
Fic. 77. 
Tmesipteris tanncnsis, Bernh. A, habit of a whole plant, pendulous form, showing 
dichotomy. Natural size. 4-/, sporophyll and synangium; / from the side, C from 
above, /) after dehiscence, £ from below, all x about 3. “=rhizome. % size. G=trans- 
verse section of stem. 4. (After Engler and Prantl.) 
elongated stalks or sporangiophores, greater: thus in S. Dazesonz they 
are twice, in S. émert three times as numerous as the segments of the 
