234 Bower . — I inperfect Sporangia in certain 
Sub-genus III. Lepidotis. 
Group of L. inundatum. 
50. L . inundatum , L. The transition from sterile to fertile leaves is 
rather sudden, the fertile leaves being slightly smaller, and widened at 
the base. The basal region of the strobilus shows sporangia abortive 
in various degrees, some consisting merely of a mass of vegetative 
cells, containing no spore-mother-cells : these abortive sporangia 
occupy the normal position, and intermediate steps lead on to the 
normally developed sporangia above. There is usually no irregularity 
of the spike in this species : in certain varieties it is very lax in habit, 
and the spike is carried up on a long stalk (var. pinnatum, Chapm., and 
Bigelovii, Tuckerm.), a habit suggestive of Z. alopecuroides. 
51. L. Drummondii , Spring. Specimens in Kew from Baron v. 
Muller show much elongated and interrupted spikes, with alternating 
sterile and fertile zones. 
52. Z. alopecuroides , L. The transition from the vegetative to the 
fertile region is not abrupt as regards leaf-form: no interruptions 
observed. In habit like a large Z. inundatum. 
In the inundatum group, which inhabits swampy ground, 
the differentiation of the strobilus in form is still only slight, 
while abortive sporangia are found at the base (Z. inundatum ) : 
Z. Drummondii even approaches Selago in its alternation of 
successive sterile and fertile zones. 
Group of Z. Phlegmaria. 
55. Z. nummular ifolium, Blume. Fertile spikes may pass again 
into foliage shoots, and these again to fertile spikes : this seems not 
uncommon. 
56. Z. aqualupianum, Spring. Ditto. 
60. Z. varium, R. Br. The strobili of this species are apparently 
well defined, and it is therefore placed in the group of Z. Phlegmaria ; 
but Sir J. Hooker’s specimen from the Auckland Islands, in the 
Glasgow herbarium, shows that sporangia of normal size are present 
far below the apparent limits of the strobilus. The latter are ‘ sub- 
tetragonous/ with broad ovate-acute sporophylls : but the sporangia 
