242 Transactions. — Botany. 



I have not seen Lundell's description of bis plant, which appears to be 

 very rare in England. But, in the " Midland Naturalist," vol. iv., 1881, 

 I find C. cyclicum figured by Mr. A. W. Wills, without description. Assum- 

 ing, as is most probable, that this figure is accurate, the English plant 

 differs from ours in having a deep narrow constriction, so that the seg- 

 ments approximate quite closely and indeed touch each other. In the 

 New Zealand variety the wide shallow constriction is quite conspicuous, 

 and the segments diverge from each other at once. 



C. botrijtis, Bory. (K. XVI.) 



In my former paper I expressed doubts' as to this species ; but many 

 specimens have since come under my observation and there is no doubt 

 that the plant occurs here plentifully. It is common near Christchurch 

 and in the Cust Valley. 



C. tetraophthalmum, Kiitzing. (B. XVII, XXXIII.) 

 Var. a, the large form. S. 



I have no specimens from Canterbury which I can with certainty refer 

 to this plant, but several occur in gatherings from Hawke's Bay. I see no 

 difference between it and the English plant. 

 Var. /3, the small form. 



Fig. 8. 



The frond is small, more orbicular than in var. a, the segments being 

 broader than long and the pearly granules are much smaller, indeed incon- 

 spicixous. I should not have considered the two as the same species, were 

 it not that in one of Mr. Joshua's English gatherings I find a plant 

 (apparently identical with this) which is labelled " Cos. tetraophthalmum, 

 small form, zygospores, not botrytis, fide Nordstedt." In that gathering are 

 some specimens in conjugation, and I have been fortunate enough to find 

 one here also in the same condition, as shown in my figure. I may observe 

 tbat Balfs, in his description of the large form, says, — " the sporangia are 

 large and their spines finally branched ; " but in his pi. xxxiii. he figures 

 the spines as subulate. Those of my English specimens are also subulate, 

 but probably in both instances the zygospores are not mature. 



Length in front view, 44 fx ; breadth, 40 p ; diameter of zygospore, in- 

 cluding spines, 65 fi. 



Bare : from Lyttelton. 



C. undulatum, Corda, var. (3, var. nov. (?) 



Fig. 9. 



The distinctive character of this plant is its small size, the length being 

 only 33 yu, the breadth about the same. In Balfs' plate xv. two sizes 

 are shown, but both are larger than our plant, and the measurement given 

 in the same work is, length T i^ of an inch, or about 63 p. 



