KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 8. 71 



2. P. Naegelii Bréb. in Prich. Infus. p. 751; Closteriuin (Netriura) Digitus N.*:g. Einz. 



Alg. p. 108, tab. 6 D. 



Crass. 41—56 ,«; long. 180—240 //. 



Wäimakariri river (5); Arthur Pass (17); Lake Lyndon (20). 



When the cell is about to divide, the middle part will become cylindrical, and, per- 

 haps, this species may be regarded as a smaller state of P. lamellosum. 



3. P. closterioides Ralfs (Brit. Desm. p. 152, tab. 24, fig. 4). 



Crass. 32 — 36 ju; crass. apic. 10 — 16 ,«; long. 160 — 240 M- 

 Blueskinbay (40). 



— (i subcylindricuni Klebs Form. Desm. p. 24, tab. 3, fig. 2 d et c (non a et b) 

 f. major. Tab. 7, fig, 24. 



Crass. 28 n\ long. 96 ,u. Lamina? chlorophjdlacea? circ. 7 (nucleis amylaceis?). 

 Omatangi (266). 



4. P. Cylindrus (Ehrenb.) Breb. in Ralfs Brit. Desm. p. 150, tab. 25, fig. 2; Closte- 

 riuin? Cylindrus Ehrenb. Infus. p. 95, tab. 6, fig. 6. (Cfr. Nordst. Sydl. Norg. 



Desm. p. 44). 

 Crass. 10 v, long. 34 ,u. 

 Taupo (157). 



5. P. polymorphum Perty Kleinst. Lebensf. p. 207, tab. 16, fig. 15; Lund. Desm. Suec. 



p. 86, tab. 5, fig. 10; Nordst. Sydl. Norg. Desm. p. 45. 

 Crass. 30—36 /u; long. 64—78 ,«. 

 Waikato (235, 238); Omatangi (252, 253); Ruapehu & Tongariro (280—1). 



6. P. cucurbitinum Bisset (Desm. Winderm. pag. 197, tab. 5, fig. 7) />' subpolymorplmm 



nov. var. Tab. 7, fig. 20. 



Membrana subtilissime dense (sed saepe evidenter) punctata. Apices cellularum ro- 

 tundati vel interdum subtruncato-rotundati. Nuelei amylacei?, lamina: chlorophyllacea?? 

 Zygospora cpiadrata, angulis rotundatis, lateribus fere rectis, membrana pluri-lamellata. 



Crass. 35 — 37 ,u; lat, constrict. 32 — 34 ,«; long. 70—86 ,t/; lat. zygospor. 60 (i 

 (vel 64 X 70 ,«). 



Omatangi (252, 253, 266). 



As the zygospores of Peniam cucurbitinum «■ have not yet been seen, I think it best 

 not quite to identify the New Zealand with the English form. 



7. P. cruciferum (De Bar.) Wittr. in Wittr. & Nordst. Alg. Exsicc. (1882) n:o 482; 



Cosmarium? cruciferum De Bar. Conjug. p. 72, tab. 7, fig. G 5. 

 Crass. 10 — 12,5 «; long. 18 — 22 u. 

 Invercargill (54). 



