308 



MISS I. B. J. SOLLAS OX THE STEUCTURE AlTD [Aug. I9OI, 



could probably be determined by grinding with a hone, a process 

 which I shall describe presently. Text-fig. 1, obtained by this method, 

 certainly seems to attest to a lateral position, and though the sporan- 

 gium seen in PI. XIII, fig. 1 appears terminal, it is obviously not 

 necessarily so, as a continuation of the stem beyond the sporangium 

 may easily have been broken away. Moreover, from the repeated 

 occurrence of sporangia at a point of branching of the stem, it 

 seems likely that this may be a natural situation. 



Pig. 1. — Sjporangium (a) in the aocU of a leaf (b) of IS", lanceolata. 



(X40.) 



[Both a and b are attached to a stem. Owing to the uuevenness of the roclc- 

 surface which was ground, the sporangium and leaf are entire, while the 

 stem is seen in section, c being the thin-walled tubes of the stem, described 

 below and seen again iu fig. 3, p. 310.] 



The shapes of the leaves are various, and this led James Buckman 

 to distinguish three species, namely, N. lanceolata, Brodie, N.petio- 

 lata, and iV. ohtusa. Now, pieces of stem are not uncommon which 



