302 Transactions. — Botany. 



Art. XXXVII.— Notes on Fresh-water Alg£e. By W. I. Spencer, M.R.C.S. 

 [Read before the Hawke's Bay Philosophical Institute, 9th October, 1882.] 

 PLates XXVI. and XXVII. 

 In continuation of the Catalogue of the Fresh-water Algae occurring in the 

 vicinity of Napier, which I laid before you last year,* I beg this evening to 

 call your attention to the following additions which have come to my notice 

 since then. 



Draparnaldia sp. ?. Fig 1. 

 Filament branched, ^a^" in diameter, tapering towards apex, cells 

 as long as, or twice as long as broad. Branchlets (ramuli) bipinnate ^-g^V' 

 in diameter, cells slightly longer than broad, terminal ones pointed, tufted, 

 near apex filament gives out a large number of elongated jointed processes, 

 which are mostly simple, but sometimes branched. I am indebted for this 

 plant to Mr. Hamilton, who discovered it in the Horokiwi stream. Possibly 

 a variety of D. glomerata. 



Cladophora pacifica, Kuch. 

 Montague (Voy. au Pole Sud) mentions this as having been found in 

 Lord Auckland's Group. 



Cladophora longiarticulata, Kuch. 

 Found by Nordstedt in the Sandwich Islands. 

 Staurocarpus. 

 Spirogyra, sp. n. Fig 2. 

 Cells square, very rarely twice or four times longer than broad, this 

 probably only when on the point of dividing, ends slightly convex, never 

 retracted. Endochrome arranged in three distinct straight bands at right - 

 angles to wall of cell, and with no visible connection. Each band consist- 

 ing of three or four minute round cellules, containing chlorophyll. Sporange 

 formed in parent cells, globular. 



Cells.— Diameter, Y y'; length, Y ^", rarely v \jf or T y, 

 Zygospore -j-^-^ 1 in diameter. 



This little plant is easily recognized by the rigidity of the filament, the 

 masonic regularity with which the cells are arranged — the convex ends of 

 which just touch — and the singular arrangement of the endochrome. 

 Common. 



Zygnema, sp. n. Fig. 3. 

 Ends of cells retracted. Contents consist of twin stellate masses of 

 endochrome. Zygospore lodged in the filament, oval, filling but not 

 bulging the cell. Spore bearing cell appears to be somewhat smaller than 

 the others. 



* " Trana. N.Z. Inst.," vol. xiv., art. xliii. 



