KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 8. 5 



I was therefore miich interested in an examination I undertook in 1875 ofthe Fresh- 

 Watcr Algaj collected by D:r S. Berggren (Lund) in New Zealand in 1874 and 1875. 

 It is however not until just lately that I have been able to coniplete this iny work. 1 

 have devoted my greatest attention to the Desmids and very little to the Phycochromaceae 

 to several of which 1 have not aflixed any name. — 1 have only taken a few Algee from 

 brackisk water into my work. 



Four speeies of Berggren's collection have been issued in Wittr. et Nordst. Alg. 

 exs. fasc. 7 et 8 (1880): Stigeoclonium subsecundum Kutz. />' tenuitts Nordst. (n:o 305), 

 Spirogyra sin.gul.aris Nordst. (n:o 361), Sp. lineata Sur. f. (n:o 359) and Tetraspora ex- 

 planata Ag. (n:o 354). I have mentioned one speeies, Pleurotcenium ovatum Nordst., in 

 Alg. et Charac. 1 p. 2. Rov and Bisset in Jap. Desm. pag. 242 say that accord- 

 ing to a figure which I have drawn Sphcerozosma granulatum Roy et Bisset occurs in 

 New Zealand. (In »Diatoms edited by P. T. Ceeve and P. D. Möller» Part. II, Upsala 

 1878, n:o 90 the following speeies of (fossil) Diatoms gathered by D:r S. Berggren at 

 Arthur's Pass have been issued: Amphora Berggrerdi Clev. nov. sp., Navicula r/tomboidea 

 E. f. gracilis, N. Tabellaria E. f. curta, iV. serians Kg. f. curta, JT. firma Kutz. v., En- 

 cyonema gracile, (E.) Rabh.). 



The number of speeies in this collection amounts to about 300. The geographical 

 distribution of the Fresh-Water AlgaB in the extra-European countries being with a few 

 exceptions almost unknown, it is not necdful to make any comparision between the Flora 

 of New Zealand and other countries. I only mention that I have not niet with any new 

 genus or with any genus not represented in Europé, with the exception of the genus 

 Phymatodocis, which nevertheless occurs in North and South America aud in Australia. 

 No doubt many of the new forms I have here set down will at some future tiine be ob- 

 served in other places. On the other hand some speeies (for instance some Closteria) of 

 which I have merely seen sterile specimens, may perhaps when found in fruit, be dis- 

 covered to belong to other speeies. — I have only found zygospores of those Desmids 

 where I have mentioned the fact. 



Prof. S. Bergghen's kindness has enabled me to give here an account about the 

 localities: 



»The Fresh-Water Alga? in New Zealand do not from several causes occur so fre- 

 quently as in the regions of the corresponding latitudes of the northern hemisphere. The 

 ground which is generally sloping gives a rapid course to rivers and brooks, and the 

 surface occupied by stagnant water, swamps and bogs is not very extensive. The com- 

 parative small number of water- and bog-plants growing sociably together (such as Pota- 

 mogeton and others), which in the stagnant waters and marshy spöts of Europé are favour- 

 able to the existence of the Fresh-Water Algas, is of great consequence. The usually dry 

 summer generally causes the draining of those lawland spöts, which in the wet season 

 (the winter) are swampy. Therfore the Algse are more frequent in the damp and moss- 

 grown localities of the mountainous regions in the nothern as well as in the southern 

 island. In the rivulets from hot springs in the Hot Lake District in the northern island 

 the Algse are, especially Phycochromaceae, but likewise Confervaceee and Zygnemaceffi, to 

 be found growing 1 in yreat abundance.» 



