115 
ENUMERATION OF AUSTRALIAN LEMNACEJS. 
By S. Kurz, Esq. 
Some time ago, Dr. Ferdinand Mueller, in Melbourne, favoured me 
with a small collection of Lemnacea from that distant part of our globe, 
requesting me at once to publish the determinations in any Journal! 
I have now the pleasure to communicate the result. 
Of the four species (the only ones until now become known), two 
are cosmopolitan forms, one is found also on the Fiji islands, and the 
fourth seems to be peculiar to Australia. 
Lemna, Linn. 
§ 1. Lemna, Auct. 
1. L. minor, Linn. 
Australia Felix, F. Mueller ! ; New Zealand,/. D. H. ; Fiji islands, 
Seemann, «. 657 ! ; Tasmania, Gunn ! 
2. X. pleiorrhiza, F. Muell. Frondicuhe oblongae, supra (in sicco) 
papillosfe, crassiusculae, marginibus purpurascentibus, pleiorrhizje. 
FrondiculfB 1-li H n . longse, liu. lataa, colore L. polyrrMza veri- 
similiter gaudentes. Radices 4-5, pallida?, crassiusculte, 1-14 poll, 
longae. 
Murray river, F. Mueller J 
This species is distinguished from my L. oligorrhiza by the greater 
. numbe r and strongness of the roots, which are much shorter, the papil- 
ose surface of the fronds, which are not concatenate, etc. 
There are a few fronds, collected in Australia Felix, differing from 
s species in their size, being nearly three times larger, and also in 
heir stronger texture. The specimens however are too incomplete to 
sa .V anything about. 
3. L. melanorrhiza, F. Muell. et Kurz. Frondicula? convexiuscuhe, 
x uiae L. polyrrhizce, oblongae v. subrotundee, subtus spongiosae, 
mono-di-rhizae, ra diculis nigrescentibus v. brands. 
rondiculae in speciminibus Australicis 2 lin. longse, lineam latse, 
°re L. polyrrhizce ; radicular longissimae, rigidulae, in sicco nigra?. 
Western Australia, F. Mueller !; Fiji islands, B. Seemann, n. 656 ! 
A his species differs from all others in the long black or brown roots, 
is therefore easily to be recognized. Dr. Seemann's specimens are 
ne arly three times larger, but otherwise not different. 
