TARGIONIA. 



332 



tunica e cellulis pluribus angulatis conflata vestita. Elateres 

 minutissimae, vaginatae, brunneae, fibra albida, pauca afFrixa.* 



Targionia hypophylla, PI. LXIX. F. Fig. I. 



1 . Longitudinal section of a young frond : the swollen part is 

 nearly solid : but the excavation is commenced : from the wall of 

 the excavation corresponding with the more solid part, cellules may 

 be seen projecting inwards : inclosing a brown nucleus, in the cavity 

 several brown sporule-like bodies were visible, the roots are attached 

 even to the swollen part 



2. Longitudinal section of a frond in which the fructification was 

 very visible, about 2-3 the mature size. The theca is but little deve- 

 loped, it presented at its apex 2 styliform bodies adhering. The 

 inner lining of the upper surface of the cavity in the frond is not 

 adherent, owing to the developement of the papillae which push it 

 downwards, forming a decided cavity. The pistilla appear to be first 

 an elongated cellular form, the divisions appearing subsequently. In 

 pulling away the theca the large trough is left where it was attached 

 to the swelling imbedded in the substance of the margin of the frond. 



3. Theca while young. The cells have no adherent granules, the 

 sporules have advanced, no elateres are yet visible. 



4. Sporule from No. 2, they are connected together by a grum- 

 ous substance which in some parts is connected into threads, the 

 rudiments of the elateres, but very indistinctly, there is no appear- 

 ance of division of the sporules into cells. 



1. Transverse section of a stoma, and the stoma itself magnified. 

 I think that the cellules forming the parietes of the opening, are laid 

 over the cellules forming the superficial shell, in an imbricated man- 

 ner. 



1. Frond portion of, and involucra. 



lb. Do. do. after the fall of involucra. 



2. Long section carried between the valves of involucrum. 



3. Theca. 



* I remember that Mirbel says I am wrong in regard to the sporula 

 of Targionia appearing cellular, but they do appear so, owing to the 

 tonic. 



