The Botany of Iceland - 01.12.1916, Qupperneq 29

MARINE DIATOMS FROM THE COASTS OF ICELAND
373
Grammatophora angulosa Ehr. var. islandicci Ehr. Per. 1. c., 358,
Tab. 1. c., íigs. 14—15.
125 samples (S. 23, S.W. 61, N.W. 10, N. 21, E. 10).
Area: Eur., Am, Grl., A. S.
Grammatophora arcuata Ehr. Grun. 0st. Diat., 18(32, 420, Tah. XI,
iig. 7.
21 samples (S. 7, S.W. 5, N.W. 2, N. 6, E. 1).
Area: Aust, Grl, A. S.
Grammatophora marina (Lyngb.) Ktz. P. D. mar., 353, Tab.
LXXXVII, íigs. 6-8.
155 samples (S. 31, S.W. 98, N.W. 11, N. 12, E. 3).
Area: Ubiquist.
Grammatophora oceanica Ehr. var. macilenta W. Sm. Per. D. mar.,
355, Tab. LXXXVII, íigs. 14—17.
28 samples (S. 3, S.W. 17, N.W. 4, N. 4).
Area: Eur.
Grammatophora oceanica forma minuscnla Per. Per. 1. c., 355,
Tab. 1. c., fig. 13.
66 samples (S. 19, S.W. 38, N.W. 4, N. 5).
Area: Eur.
In a sample from Skerjafjörður (S.W.), H.Js. I have found a curved
Gram. oc. macil, of which I have given a figure in tab. nost. fig. 15. It
has the dimensions: long. 73 fi, lat. 6.5 ju.
Grammatophora serpentina Ehr. Per. D.mar., 356, Tab. LXXXVIII,
iigs. 2—5.
Vestmannaeyjar (S, 2 samples), H.Js.
Area: Ubiquist.
Rhabdonema Ktz. 1844. V. H. Trt, 360.
Rhabdonema adriaticum Ktz. V. H. Trt, 360. Tab. XII, lig. 486a.
Vestmannaeyjar (S, 3 samples), H. Js.
Area: Ubiquist.
Rhabdonema arcuatum (Ag.) Ktz. V. II. Trt, 360, Tab. XII, fig. 487a.
303 samples (S. 38, S.W. 126, N.W. 21, N. 77, E. 36, S. L. 5).
Area: Ubiquist, Grl, A. S.
Rhabdonema arcuatum is a form which, as regards its outline, is
variable, and in the samples examined by me, it appears with recti-linear
as well as with more or less curved sides (see Cleve’s var. ventricosum
in Cl. Arct. S, 24, tab. IV, fig. 21). The curved species may perhaps be
identical with Rhabd. Crozieri Grun. Concerning this see Mann, Albat.
322 under Tessela catena Ehr.