CYCADOFILICALES 



35 



his new genus Lagenosioma as L. physoides. This species Oliver 

 restores as Physostoma elegans, and associates with it Arber's 

 Lagenostoma Kidstonii (51). P. elegans is also the Sporocarpon 

 ornatum of Williamson (4, 8), as well as his 5. anomalum (8, 19). 

 It is thought to belong to some one of the Lyginodendrineae (Lygino- 

 dendreae) not yet distinguished. 



Figs. 30-34. — Lagenostoma Lomaxii: fig. 30, diagrammatic longitudinal section 

 of ovule with its investing cupule; figs. 31-34, transverse section at the levels A, B, 

 C, D, respectively; n, central portion of the nucellus, and «' the outer hardened 

 portion, with the pollen chamber {_p) between; i, integument; c, cupule; 6, vascular 

 bundles. — After Oliver (550). 



The seed is small and oval (5 . 5 to 6 mm. by 2 mm.) with a nar- 

 rowed base, usually ten-ribbed, and circular in section. There is 

 no trace of a cupular sheath as in Lagenostoma. A very remarkable 

 feature, however, is that the integument, free only in the region of 

 the pollen chamber, is broken up into ten "tentacles," the direct 

 prolongations of the ten ribs (figs. 35-39). Ribs and tentacles are 

 covered by long, club-shaped hairs. These tentacles of Physostoma 



