101 
Dec 81, 1909. The Queensland Naturalist. 
This species also is here for the first time announced to be 
among the Queensland flora. It au'ords an example of the 
diversity of measurements given by diherent writers, 
for while Kutzing gives the diam. of the threads at 25 y : 
Rabenhorst, at 26-31 fx ; Petit at 28-33 ^ ; and Gay at 
25-30 /X ; the specimens examined by me ranged from 
28-41 
Pound in fruit in June, in slow or still Avater. 
Spirogyra calospora (Fig. 3). 
This species is described by Prof. Moebius in Mr. 
Bailey’s Botany Bulletin, No. VI. It is unknown to me 
except by the various descriptions of it, from which it appears 
to be a very variable species, with slender, lax, single spiral 
band and fruiting cells sometimes swollen, sometimes not. 
Its most characteristic distinction is the finely punctate 
or scrobiculate membrane of the spore. My figures are 
after Petit and Wolle. 
Spirogyra flavescens (Fig. 4). 
This, and all the succeeding species, belong to the 
section, “ Sterile threads with the ends truncate.” Various 
writers give a range of from 11 to 20 /x in the , thickness 
of the threads ; mine varied only betAveen 20 and 21 p. 
Spirogyra communis (Fig. 5). 
This s])ecies forms another addition to the list of 
Queensland species. The figure is a copy of a photograph 
from life. It very closely approximates the last species 
in size, but is distinguished from it by the form of the 
sporiferous cells, which are either not swollen, or swollen 
only on the conjugating side, Cooke gives this as a variety 
of the next species, S, longata, from which, however, it 
seems to be ^distinguished specifically by the smaller 
variation in the dimensions, and by the shape of the spores. 
The Queensland specimens agree well with the French 
except in length of cells, an unimportant character, and 
in the diameter of the spores, which is slightly greater. 
It is easy, however, to identify the species by means of the 
attenuated ends of the spores. 
Spirogyra longata (Fig. 6). 
Professor Moebius has provisionally placed the 
Queensland specimens, examined by him, in this species. 
He says ; “ In this species the cells in fructification are not 
swollen, and as far as this fact is concerned it would not 
be possible to assign to it the alga now being described.” 
Coolve, however, says that the fruiting cells are swollen. 
According to my observations they are, for the most part, 
not swollen, but show occasional exceptions to this rule. 
It is a very variable species. I have found sterile threads 
slightly thinner and slightly thicker than any I have found 
