430 jons. Hovi; i'Kri:usi;.\ 



Dactylococcus caiulaliis var. Licaiidaliis Hansj^irg 1887, p. 8(), Hans- 

 girj< 188(1. p 11 



Oiiroroctus hicaiHlafiis Cirobcly l*.)()!t. p. .■{.")7. 



KtTatococcus caiulaliis Pasclicr SusswasscrllDia Ilcfl. 3, l'Jlo, p. 217. 



K. k-fl. (il. 



TIk" {icniis Duclijloroirns was establislicd in 184'.! by Nageli (iatl. 

 cinzell. .\lgcMi p. 85) witli Ihc species I), infiisioiium. (Irinlzcsco main- 

 tained 1902) tlial I), iii/'iisioniiiu is a form of Scciicdcsimis acutiis Meyen. 

 'I"h()ii;ili I have niy (ioiibts al)oiit the correctness ol" (i ri n l/,e scos idcii- 

 lilicalion of the alga cullivaled by hiin witii Ddclijlonnciis iiifnsioiiuii} 

 Nag. (cf. Boye Petersen 1915, p. 332\ I consider it lighl lo g'we J). hi- 

 iiiiuiattis a new generic name as attenipted by Grobéty (l.c.;. Unlortunately 

 the name she selected had already with a siight dillerencc in the spelling 

 Ijeen eniployed for another alga, so Pascher gave tlie genus a thiid 

 name Kiidlococcus (l.c. .• C.iirionsly enongh Pascher on that occasion 

 rejected tlie f)ldest specific name, viz. hicuudutus A. Br. from 18(i8. substi- 

 tuting anidutus Hansg. from 188(5, and was thereln followed by Piiymaly 

 1924, p. 219. I consider this incorrect. so I have revived the earlier 

 name. Md. Grobéty has shownl. c.) that I). anuhtUis Hansg. and ]). hi- 

 caiidatus A. Br. are identical. the cells in the species having now two, 

 now one elongation. Wilhout knowing Md. Grobétys work I have 

 asccrtained tlie same faet by observing the miiltiplication of a single 

 ceil. 1915. p. 332, Tavle II. tig. 34 a. b. 



Hansgirg had without ccremony reduccd the name bicaudalus to 

 thai of a variety Cl. c.) under a new species D. caudatns. As the autlior 

 of the species he put Reinsch in brackels, it is true, but evidenlly 

 this does not mean that that author called the species cauddliis but 

 referred it to another genus, as it would mean according to modern 

 usage. It appears plainly enough from Hansgirg' s own statement 

 (1887, p. 86 that iie only means that Beinscii was the tirst to observe 

 and figure the form with only one elongation sub nomine Gharacium 

 |)y ri forme . 



In Iceland I have only found the species in few specimens on soil 

 by the roadside near Hallormsla(^ir among mosses and Protonema. 



In Denmark I have found the species on earlh, granite, walls. bark, 

 thatched roofs, and old Polypori .Boye P. 1915. p. 333 . Puymaly 

 most frequently found it on the last substratum, and on rotten wood 

 and straw 192 1, j). 223 1. 



Oocystis rupestris Kirchn. Printz 1913, p. 174, Tab. IV, lig. 7— 9. 

 Wiltr. et Nordst. Alg. exsicc. No. 725. 

 S. Icel. 352. 



On the lower damp part of the Sæluhus (travcllers' shelter on 

 MosfellsheiiM I found an Oori/slis which 1 refer with some doiibt to the 

 present species. The cells were 30 /; long. 12// broad, furnished with 1 

 chromato|)hoie with a distincl pyrenoid surrounded by staicli. Ilowever, 

 the cells dilfered from the typical O. nipcslris by the wall as a rule 

 showing a rathcr distincl Ihickening at one pole. 



O. nifxslris is one of the species that thrive well on damp rocks. 



