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 fi long, 7 — 11 ju broad. Hyaline hairs were not present. I think 

 it therefore best to consider the Danish alga as representing a distinct species. 



According to Batteus (1. c), Cr. Hauckii is identical with Cnioriella armorica 

 Hauck, Meeresalg. p. 31 (non Crouan). An examination, through the kindness of 

 Mrs. Weher-van Bosse, of a microscopical preparation of this species from Hauck'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 //, 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. 1 m; MK, Holmtiinge Tange, 1 — 2 m. — Ke : 

 North end of Groves Flak (Bargesen). — ^ Lb : At Lj'ngsodde off Middelfart, 15 -19 m. 



2. Cruoriopsis gracilis (Kuckuck) Batters. 



E. A. L. Batters, Catal. of the Brit. Mar. Alga' (Suppl. to the Journ. of Botany 1902), p. 95. 

 Playiospora gracilis Kuckuck, Benierk. z. mar. Algenveg. v. Helgoland II. Wiss. Meeresunters. N. F. II. 



Bd. Heft 1, 1897, p. 393. - . i 



Cruoriopsis criiciata Batters, New or critical Brit. Mar. Alga;. .Journ. Bot. 189(j, 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 to Kuckuck's 

 rather short description. 



' Another specimen in Hauck s herbarium, labelled Cruoriel la armorica, from Rovigno was sterile, 

 and evidently belonged to anotiier species, possibly a species of Cruoria. 



24* 



