COLENSO'S ^EW-ZEA.LAXD HEPATICJE. 277 



The stylus (at the postical insertion of the leaf-lobule), which 

 can be found, with rare exceptions, in every Frullania, and may 

 be traced also in the female bracts as a more or less conspicuous 

 tooth or lacinia at the base of the postical margin, is sometimes 

 developed into a large lanceolate leaf overlying the cucullate 

 auricle or leaf-lobule- This variability leads to the conclusion 

 that the said stylus is nothing but a reduced lacinia of the leaf- 

 lobule. I have the authority of Dr. Spruce in support of this view 

 (see Trans. Bot. Soc. Edinb. xv. (1881) p. 3). The stylus springs 

 from the base of the lobule, just as in Cololejeunea, the only differ- 

 ence being that in the last it is free; in Frullania, however, more 

 or less connate to the leaf-lobule. In both, the stylus is certainly 

 part of the leaf, and stands in no relation whatever to the 

 stipules. Mr. Pearson, in his last paper on Canadian Hepaticae, 

 has given expression to the opinion that in Cololejeunea the stylus 

 is the remnant of a normally bifid stipule. I may be allowed to 

 differ from this view. Cololejeunea, though having no stipules f 

 produces radicles on exactly the same places where in other 

 Lejeunece stipules are found ; in Cololejeunea the latter have dis- 

 appeared, the rootlets, which always spring from the base of the 

 stipules in Lejeunea, alone remain, and point out the place 

 where stipules once stood. This place, however, is as far away 

 from the stylus folii in Cololejeunia as stipules are in Frullania; 

 and no relation between the two organs can be established. 

 Certainly an organ cannot be called a remnant of another if they 

 do not spring both from the same spot. 



(3) Nakdia initndata. — This is a good species of Nardia 

 of the section of Eucalyx, Lindb., and very similar to our 

 European Nardia obovata, having the perianth deeply immersed 

 and the free part of the female bracts horizontally patent. 



(4) Hymenophytum. — This genus was founded by Dumortier 

 on Jungermannia flabellata and J. Hymenophyllum ; the last is a 

 true Symphogyna, having the female flower on the antical side 

 covered by a small scale ; it springs from the very point where 

 the midrib forks, and is inserted just above the central fascicle 

 of brown cells. The antheridia, covered by similar small scales, 

 stand in a long row on the antical side of distinct plants. I 

 have been able to examine Hooker's original plant. 



Jungermannia flabellata alone is therefore the type of Du- 

 mortier's genus Hymenophyton, which has the flowers, male and 



