THE AERIAL ALGÆ OF ICELAND 333 



N. p. V. Flotowii, Nilzschia sinuata, Pinnularia gracillima, P. lala, P. viridis 

 V. commutata, Rhopalodia gibha). 



85. Same rockj^ wall, a drier spot, in a crack. 



(CJiroococcus turgidiis, Gloeocapsa alpina, G. rupestris, Glocothece 

 rupestris, Scytonema Myochrous, Stigonema informe, Caloncis f'asciata, 

 C. Silicula v. gibbcrula, Cymbclla æqualis, Diatoinella Balfoiiriana , Di- 

 ploncis ovalis v. oblongella, Eunotia prærupla f. curta, Fragilaria muta- 

 bilis, Gomphonema parvulum, Melosira Roeseana, Meridion circulare, 

 Navicnla contenta, N. perpiisilla, N. p. v. Flotowii, Nitzschia amphibia, 

 A'^. Denliciila, N. perpusilla, N. sinuata, Pinnularia borealis, P. Hrcbissonii, 

 P. gracillima, Rhojjalodia parallela v. minor, R. ventricosa, Stauroneis 

 parvula v. producta). 



86. Same rocky wall in a place with an oulflow of water. 

 (Tribonema bombycinuni, Vaucheria borealis, Acbnanthes coarctata, 



A. lanceolata, Cymbella lanceolata, C. aspera, C. parva, Diatoma hiemalis, 

 Diatomclla Balfouriana. Diploneis ovalis v. oblongella, Epithemia Zebra, 

 Eunotia lunaris, Fragilaria mutabilis, Gomphonema parvulum, G. sub- 

 clavatum, Hantzschia amphioxys, Melosira Roeseana, Meridion circulare, 

 Navicula perpusilla, Nitzschia amphibia, Pinnularia borealis, Rhopalodia 

 ventricosa, Synedra Ulna, Tabellaria flocculosa (|)artim det. E. Østrup)). 



87. Same rockj' wall, stones with an almost black coating; damp. 

 (Scytonema Myochrous). 



88. Rocky wall in Fljotsdalur, with plenty of water streaming 

 down it. •^'^/e. 



(Cosmarium sp., Hormidium flaccidum, Tribonema bombycinuni, 

 Achnanthes coarctata, A. lanceolata, Ceratoneis arcus, Cymbella naviculi- 

 formis, C. lanceolata, Diatoma hiemalis, Diatomella Balfouriana, Diploneis 

 elliptica, Epithemia Zebra, E. Argus, Eunotia prærupta f. curta, E. ro- 

 busta V. Diadema, Gomphonema subclavatum, Hantzschia amphioxys, 

 Meridion circulare, Navicula perpusilla, N. radiosa, Nitzschia Denticula, 

 Pinnularia divergens, P. viridis, P. borealis, Rhopalodia ventricosa, Sijnedra 

 Ulna, Tabellaria flocculosa, T. fenestrata. (partim det. E. Østrup)). 



89. Same rockj' wall; black, thin layers, only scraped off the stone 

 with difficulty. 



(Calothrix parietina, Gloeocapsa alpina, Nostoc sp., Schizothrix Heuf- 

 leri, Scytonema crustaceum). 



90. Same rocky wall, a place with plenty of water streaming down. 

 {.Calothrix parietina, Gloeocapsa alpina, G. rupestris, Plcctonema 



roseolum, Rivularia sp., Scytonema mirabile. S. Myochrous, Stigonema 

 mamillosum, Diatomeæ, Desmidiaceæ, Zygnema sp.). 



91. Same rocky wall, a place with plenty of water streaming down. 

 (Hormidium llaccidum, Tribonema bombycinuni, Amphora ovalis, 



Cocconeis Placentula. Cyclotella anti(|ua, Cymbella parva, C. Cistula. 

 C. ventricosa, C. lanceolata, C. cuspidata, C. cymbiformis, C. Ehrenbergii. 

 C. amphicephala, C. helvetica, Diploneis elliptica, D. ovalis v. oblon- 

 gella, Epithemia Zebra, E. Z. v. proboscidea, E. sorex v. amphicephala, 



