308 



JOHS. hoTe pktkuskn 



West 1902 r. lypica and anabæiu)i(tc.s. llclj^avaln. in watcr al ao " and 

 at Ihc marj^in of springs 60^—65" 'Vs 1914 I", phonnidioides. Stora 

 Kroppar. lemp. 39"- ^'s 1914 f. typk-a; 26"— 35" f. anaba-noides. Hcyk- 

 holt. on nioss at Ihe margin ol' tlio outlot from Skrilla ^/s 1914 f. ana- 

 bænoides. in oiitlct from Skrilla, tcmp. 25" ''/s 1914 f. anabænoides. 

 — S. Iccl. Reykjavik Laugarnar leg. Stp., det. C. Flahault! f. analjænoidcs. 

 Geysir. outlet. temp. 40", West 1902 p. 244 f. ty|)ica. Laiigarvatn, outlet 

 from a 'Iimm ". lemp. 40" '^/s 1914 f. anabu'iioides. 



Area: All eontinents. almost exeUisivcly 

 in hot springs. 



Bornet et Flahault (Revision 111 p. 56) 

 direct attention to the exccptional richness 

 in forms of this species. If one examined 

 a niimber of spceimcns of it, one might 

 feel inelined to refer it to sevcral varying 

 genera in thai il now occurs as a distinet 

 Sirosiphoniacea with branehings, now re- 

 sembles an Anahcnui . and now a Phormi- 

 diiiin of the groiij) Monilifurinid Gom., the 

 helerocysts being but fainlly devcloj)ed or 

 totally laeking. This species has therefore 

 an exccptionally long series of sN'nonyms — 

 which are constantly incrcased. 



Thus I do not doubt that Aulosira ther- 

 malis West (1902 p. 244, tab. 4 39, figs. 1- 

 10) is, in faet, the Aiialnrna-Wkc form of 

 Ilapalosiphon laniinosus It is, as already 

 menlioned, by no means possible to dis- 

 cover branehings in all sanijjles of this 

 species cj). Schmidle 19(10 p. 177', and we 

 have then but the basal Ihreads left, these 

 being highly Aiuihd'iia-Vike. 1 have asccr- 

 tained that such forms are found among the 

 exsiccata cited by Bornet et Flahault, e. g., 

 Wittr. et Nordst. nr. 758 of which especially 

 b. and c. contain ,\/K//)a7ja-like forms. Wlie- 

 ther those largcr cells willi ,L;r;iiuihir cell 

 conlents mentioned by West aclually are 

 ludging by Wests figures they do not seem 

 to possess any disliucl spore inembrane. In tlie leelandic sam|)les I 

 have olien observed such larger granular cells; but 1 do not believe 

 they are s])ores. 



For the rest it is strange thai West rcferrcd this species to the 

 genus Aulosira, the chief distinguishing character of which is "vagime 

 membranaceæ arclæ", these giving the whole thread a Toliipolhrix-hke 

 appearance. This is absolutely not the case in Aiilosint Ihcrimilis West 

 which is su|)posed to have "vagina delicatissima hyalina", Ihe sheaths 

 being nol visible at all in the ligurcs. When West lurtheriuore 1. c. 

 p. 244 records that Maslif/ncladus htniiitosus from Hveravellir and the 

 great Geysir are lo somc exlent enerusled willi lime this is probably 



Fif,'. 15. Hapalosipbon laminosus 

 Cohn) HaiKSf?. (X60()). 

 a. f. typica. 

 1). f. aiiabænoides. 

 c. f. phormidioides. 



spores is rathcr doubHul. 



