91 
organs (Comp. Borner 1904 p. XIX). On the contrary, they bear abundant 
sporangia, in much greater number than in the Danish plants, very often two on 
each cell, 10—11 w long, 6-7 » broad, consequently nearly as in our plants, and 
of the same shape. The thickness of the filaments is the same (5,5—6 4), the basal 
cell is ca. 10 in diameter and the chromatophore is parietal, and finally Crovan’s 
plant grows on an Ectocarpus like the Danish plant. All these agreements suggest 
that Crouan’s plants are asexual individuals of Ch. gynandra. 
Locality. Kn: Tonneberg Banke, ZA, 12 to 18 meters, July. 
2. Chantransia rhipidandra sp. nov. 
E cellula basali globosa vel rarius leviter depressa, diametro c. 14 (13—15) y, 
2—3 fila erecta parce ramosa usque ad 350 y sallem alta, egrediunt. Rami sparsi 
simplices vel parce ramosi. Cellule (7,5—) 9—11 y late, diametro 2—3 (—4)-plo 
longiores, chromatophorum stelliforme, pyrenoide centrali, in parte superiore cellulæ 
sito, instructum, continentes. Fila primaria ramique apice plerumque pilo hyalino 
instructi. Sporangia in filis lateralia sessilia aut stipitata, stipite unicellulari, sparsa vel 
(rarius) opposita, sæpe seriata, monospora, ovata vel obovata, long. 14—18,5 y, lat. 
9—10 y. Antheridia in ramulis, in una fere planitie ramosis, semiflabelliformibus ter- 
minalia, 6—6,5 » longa, 4—5 y crassa. Carpogonia in filis primariis vel in infima parte 
ramorum sessilia; cystocarpia subglobosa; carpospore in cellulis ultimis cystocarpii 
formats, eadem fere forma et magnitudine ac monosporæ. Antheridia et carpo- 
gonia in plantis distinctis, sporangia in plantis distinctis aut in plantis sexualibus. 
This species is distinct from all well-defined species with one basal cell. Thus, 
it differs from Ch. microscopica (Nægeli) (1861, p. 407 figs. 24, 25) by its globular 
basal cell! being much broader than the filaments and giving off 2 or 3 filaments, 
and by having longer cells. From Ch. hallandica it differs by its larger proportions, 
the position of the antheridia and the form of the cystocarpia etc., from Ch. micro- 
scopica var. pygmeea Kuckuck (Bemerk. Helg. II, p. 392 fig. 15) in the dimensions, the 
absence of endophytic filaments etc. Ch. unilateralis KsELLMAN (Algenfl. Jan Mayen, 
Arkiv f. Bot. Bd. 5 No. 14, 1906 p. 11) differs by having much thicker and more 
branched filaments and almost globular sporangia, and Ch. Alariæ Jonsson (Mar. 
Alg. Iceland. Bot. Tidsskr. vol. 24 p. 132) differs also by having much thicker and 
more branched filaments, and further by the branches being often opposite; both 
these species are devoid of sexual organs. From the short description given of Ch. 
microscopica BATTERS (Journ. of Bot. 1896 p. 9) it appears that this species can 
scarcely be identified with our species, for according to Barrers the antheridia 
form “very compact clusters at short intervals along the axes and branches”, and 
1 NEGELI mentions and figures in Acrochætium microscopicum a basal disc, “von welcher es 
(nach Untersuchung an getrockneten Exemplaren) zweifelhaft bleibt, ob es eine niedergedrückte scheiben- 
förmige Zelle oder nur Verdickung der Membran ist (Fig. 24, 25)”. On examining the specimens of this 
species in RABENHORST's Die Algen Europas No. 1650, I have found that this basal dise is a cementing 
substance, occurring in all the species of this section. 
12* 
