AZuLLA. 



509 



many filaments, some of which under pressure (before which they 

 did not appear) seemed to pass down the canal. £ 



Pig-. IV. — A pair of pistilla, after slight pressure, in the left hand 

 one, the sac is distinct, but quite enclosed : from the open mouth, 

 grume confervoid granules, and filaments protrude ; and it appears 

 that the filaments afterwards observed really are composed of the 

 granules above the apex of the sac. 



In the right hand one they are less distinct; only grume being 

 visible ; from the umbilicate apex, this appears to be more developed 

 than the other ; T \ showed that the filaments were filamentous portions 

 of the protruded mass, i. e. that they are protruded from it, and are 

 composed from it. ^. 



Fig. IVa. — This represents a single pistil, contained singly in an 

 involucre, which appeared quite closed. It is not distinguishable 

 from the young states of mnny ovula ! No filaments were observed, 

 and only a very few of the capitate cells. ^. 



Fig. V. — Very young involucre, ^ ; it appeared as tho' formed of 

 three parts, but possibly the posterior part may belong to the leaf, 

 it contained two antitropous bodies, one rather more advanced than 

 the other; the right hand figure represents them under pressure 

 under 1-16 : each cell contains a green nucleus, and looks as if 

 studded with nails. 



Fig. VI. — In this there were two pistilla, one less advanced, with- 

 out confervoid filaments, but with a bit of grume projecting: the 

 other with protruding filaments, burst accidentally, the lower filament 

 I think is continuous with the apecal protruding ones. 



Fig. VII. — This represents the pedicellate bodies of Azolla pinnata 

 after their natural escape from the hody (Ovulum). They were seve- 

 ral ; and were found mixed with the oblong amorphous bodies, but 

 such dehiscence appears unusual, for I find both bodies generally 

 mucilaginous looking, the one containing pedicellate bodies, the other 

 appearing to be an intricate mass of laminae, not unlike that of 

 the cutis of the plant. In the pedicellate body, or theca represented, 

 there w r ere two frondiform sporules. On which it is to be remarked, 

 tint the root-like prolongations were not found to be so pronounced, 

 as in those which appeared to be undergoing the natural process : viz. 

 those contained in the dissolving ovidam, mixed with remains of the 

 thecae themselves. 



