187 
January 1896, thus apparently a type specimen, but differing from the author’s 
description in the dimensions of the erect filaments and the sporangia, the first 
being thin in their whole length, 3,5—5 » in diameter, not broader at the base, 
thus much thinner than in our species, and consisting of much more lengthened 
cells (fig. 109). Further, the crust appeared to have another consistency than the 
Danish plant, the filaments being connected by a gelatinous substance, while the 
special membranes of the cells were not distinct. The sporangia were smaller, more 
lengthened, 18—25 » long, 7—11 broad. Hyaline hairs were not present. I think 
it therefore best to consider the Danish alga as representing a distinet species. 
According to BATTERS (I. c.), Cr. Hauckii is identical with Cruoriella armorica 
Hauck, Meeresalg. p. 31 (non Crouan). An examination, through the kindness of 
Mrs. WEBER-VAN BOSSE, of a microscopical preparation of this species from Haucx’s 
collection, labelled Neapel 1878, has shown me that this plant is different from the 
Danish, and also from BATTERS’ species. The crust is thicker, up to 164 y, the basal 
layer consisting of much larger cells, the erect filaments are thinner, more loosely 
united, sometimes dichotomous above, the sporangia regularly cruciate and much 
larger, 46—56 » long, 26—28 » broad (fig. 110)’. 
Cr. danica reminds one not a little of Cr. arctica K. Rosenv. (1910, p. 102); it 
forms, like this, small, thin, blood-red crusts on stones. It differs by lower cells 
in the basal layer, occasionally fusing with the neighbouring cells, by the presence 
of hairs, by the oblique division of the sporangia, and by the fact that the spor- 
angia are always terminal, never lateral. It must be admitted that two sporangia 
may sometimes be found at the end of an erect filament, one of which must pos- 
sibly be regarded as lateral, but they are in fact both placed terminally on the 
filament (fig. 108 C), while in Cr. arctica, true lateral sporangia occur. Finally, the 
sporangia are somewhat larger. 
The species grows on stones in 1 to 17 meters depth; it has been found with 
ripe sporangia in April (Groves Flak) and September (Sondre Ron by Lemvig). 
Localities. Lf: M, Sendre Ron by Lemvig, c. 1m; MK, Holmtunge Tange, 1—2 m. — Ke: 
North end of Groves Flak (Børgesen). — Lh: At Lyngsodde off Middelfart, 15—19 m. 
2. Cruoriopsis gracilis (Kuckuck) Batters. 
E. A. L. Barrers, Catal. of the Brit. Mar. Algz (Suppl. to the Journ. of Botany 1902), p. 95. 
Plagiospora gracilis Kuckuck, Bemerk. z. mar. Algenveg. v. Helgoland II. Wiss. Meeresunters. N. F. II. 
Bd. Heft 1, 1897, p. 393. 
Cruoriopsis cruciata Batters, New or critical Brit. Mar. Alg&. Journ. Bot. 1896, p. 388. 
In July 1915 I found by dredging in the Little Belt near Middelfart a few crusts 
on stones, agreeing perfectly with the plant described by Kuckuck under the name 
of Plagiospora gracilis. A few additional remarks may be given here lo Kuckuck’s 
rather short description. 
7 Another specimen in Haucx’s herbarium, labelled Cruoriel la armorica, from Royigno was sterile, 
and evidently belonged to another species, possibly a species of Cruoria. 
24* 
