140 FERNS. 
radical leaves and a stalked terminal solitary spike. The genus 
Lycopodium contains the so-called Club-mosses, although the 
name is derived from some fancied similarity of the branches of 
some species to a wolf’s foot. The fruits of all species of Lyco- 
podium are uniform one-celled and two-valved, filled with count- 
less dustlike inflammable spores, whereas the fruits of Se/aginella 
are of two kinds, the one sort akin to those of Lycopodium, the 
second kind 2-4-valved, including 1-6 larger spores. Of the 
former genus five species are known here as indigenous, of Sela- 
ginella only two. The only plant of Lycopodiacee, which much 
attracts the attention of Fern-collectors, is the Tmesipteris Tan- 
nensis, generically so called, because the fruits are seated in the 
upper notches of the deeply incised fronds. It delights to grow 
on Fern-stems, and it is readily recognised among allied plants by 
the leaflike segments of the fronds and by the very broad bilobed 
and two-valved fruits. The first place of discovery of this 
graceful Fern seems to have been the island of Tanna or Tana in 
the New Hebrides. To Lycopodiaceze might also be referred our 
only Jsoetes, which grows submersed, is stemless, and has tufted 
awlshaped leaves, the bases of which surround two kinds of fruits 
with larger and with subtle spores. The Greek name of the 
genus is to indicate, that these aquatic plants remain unchanged 
throughout the year, not shrivelling in their continuous growth. 
Our Isoetes (I. Muelleri) is within this colony as yet only known 
from the Barwon, where it was found by Mr. Fullagar, and from 
the vicinity of the Richardson-River, where it was gathered by 
Dr. Cyrdie. The species extends however to Queensland. Others 
may yet be sought here, particularly in alpine waters. 
