298 



jcHis. iKUi: 1'i:ti:iusi:.n 



Anabæna Poulseniana Hove P. n. sp 



A. slralo ^elalinoso, ad hi])i(les submcrsos cxjianso, vel clonf»ato-cy- 

 liiuirico, vel lil)i're natante; vaj^iiiis sæpe C()n.s[iiciiis; trichniuatibiis rcctis 

 vel leviter ciirvalis; arliciilis sphærieis vel (loliilorniihus, 4 — 4.5 ii erassis 

 et loiif^is vel paiilo longioribus, celliila apicali obtiise conica; hclerocyslis 

 eylindricis, 5-5.2 /< crassis, 1 1 — 17.6 // lonj^is; sporis cylindrieis. apieibus 

 rotiindato-triincatis, (5.4—7.4// crassis, 15-44// lotif'is. sa^pe 2 — 4 seriati.s, 



ab lieteiocystis pleriinupie re- 

 motis; e|)isporio lævi in .si)oris 

 maluris pallidissime lulij^ineo. 



V.. le el. Myvatn, oii slones 

 ^' fl — 4 rt. water^ and waslied 



ashore, tcnip. 16° ^^-'^/t 1914. 



— Myvatn, on Cladophora, wasbcd 



CJLJU ashore ^Vt 1914. Skulusta.Mr, 



--~;:^= small pool of water. inlo wliieli 



spring llows, tcnip. 



a 



7^' 



17 



ODOOOCOCO. 



æ©@®o 



a 



Fig. 10. Anabæna Poulseniana n. .sp. 

 1X1200). 



1914. 



On Ibe last nicnlioncd lo- 

 cality projeeted Ironi the bot- 

 toni ol' the pool straj^j^linj^ \vi.s|)s 

 rounded at the top, supported 

 by an air-bubblc. These tiifts 

 were conipo.sed of ('Aianophij- 

 cc(v, especially Aiutlnviut Poiil- 

 senidna, Oscilhtforia liiuosa and 

 sancUt, Tolijpolhrix s]^. as well 

 as nunicrons Duttomeæ. 



Anahænd Poiilscniand bc- 

 lonj^s to sect. II Dolkliusjjcrnuiin 

 (Born. et Flah., Hev. IV p. 225) 

 and approaehes cs])ecially to 

 .1. laxa A. Hr. and A. iiuniiidlia 

 Kiitz.i Born. et I-'lah. llowever, 

 it (liirers distinctly from both these species which can easily bc scen 

 from the diagnosis. The leading characleristic of A. IdXd is llie almost 

 identical thickness of its vegetative cells, helerocysls and spores. The 

 same applies to .1. IdXd var. hoiicnsis Playfair 191.S ji. 505) which is 

 especially characterized by its elongated. cylindrical heterocysts and long 

 spores. But as there is. in faet, a great dillerence in diameter between 

 the vegetative cells and the spores of A. Ponlsrnidiut. I do not consider 

 it to be identical with any variety of A. l(txa. Diiring the later years a 

 niimber of Analunui species, all of which belong to the same allinity, 

 have been established. Of these I shall mcntion: .\. diufstumdlis Schmidle 

 (Iledwigia 1899 p. 174), A. obloiif/d De W'ildeman (;\nn. du .lard. hot. de 

 Buitenzoig Suppl. 1, 1897 p. 50), .1. Hirrniuiinusii Lemm. 1910 p. 182). 

 The mode of growth of A. suhci/liiiihii-d Borge 1921 p. 12) corre- 

 sponds almost exactly to ,1. Poulseniana, bul tlie former species belongs 

 to Sect. Sphærozij(jd. 



I have nnmed this species alter the hite Professor. Dr. |)hil. \'. ,1 



