i)l 



organs (Conip. Boknet 1904 p. XIX). On llie conlrary, they hear abundant 

 sporangia, in much greater number than in the Danish plants, very often two on 

 each cell, 10 — 11 ;i long, 6 7 a broad, consequently nearly as in our plants, and 

 of the same shape. The thickness of the lilaments is the same (r),5— 6/^), the basal 

 cell is ca. 10 « in diameter and the chromatophore is parietal, and finally Crouan'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 : Toiuieberg ISanke, ZA, 12 to 18 meters, Jul^'. 



2. Cliaiitrausia liiipidaiulra sp. nov. 



E cellula basali globosa vel rarius leviter depressa, diametro c. 14 (13 — 15) «, 

 2 — 3 fila erecta parce ramosa usque ad 350/7. saltern alta, egrediunt. Rami sparsi 

 simplices vel parce ramosi. Cellulse (7,5 — )9 — 11 /x lataj, diametro 2 — 3( — 4)-plo 

 longiores, chromatophorum stelliforme, pyrenoide centrali, in parte superiore cellulse 

 sito, instructum, continentes. Fila primaria ramique apice plerumque pilo hyalino 

 instructi. Sporangia in fills lateralia sessilia aut stipitata, stipite unicellulari, sparsa vel 

 (rarius) opposita , ssepe seriata, monospora, ovata vel obovata, long. 14 — 18,5 fi, lat. 

 9 — 10 fj.. Antheridia in ramulis, in una fere planitie ramosis, semiflabelliformibus ter- 

 minalia, 6 — 6,5/7. longa, 4 — 5 /7 crassa. Carpogonia in fills primariis vel in infima parte 

 ramorum sessilia; cystocarpia subglobosa; carposporse in cellulis ultimis cystocarpii 

 formatse, eadem fere forma et magnitudine ac monosporse. 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 (Nsegeli) (1861, p. 407 figs. 24, 25) by its globular 

 basal celP being much broader than the filaments and giving off 2 or 3 filaments, 

 and by having longer cells. From 67?. hallandica it differs by its larger proportions, 

 the position of the antheridia and the form of the cystocarpia etc., from Ch. micro- 

 scopica var. pyymcva Kuckuck (Bemerk. Helg. II, p. 392 fig. 15) in the dimensions, the 

 absence of endophytic filaments etc. Ch. unilateralis Kjellman (Algenfl. Jan Mayen, 

 Arkiv f. Bot. Bd. 5 No. 14, 1906 p. 11) ditTers by having much thicker and more 

 branched filaments and almost globular sporangia, and Ch. Alar ice 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 Batters the antheridia 

 form "very compact clusters at short intervals along the axes and branches", and 



' N/EGELi mentions and figures in Acrochwtium microscopicum a basal disc, "von welcher es 

 (nacli Untersuciiung an getrockneten Exeniplaren) zweifelliaft bleibt, ob es eine niedergedriickte scheiben- 

 formige Zelle oder nur Verdickung der Membran ist (Fig. 24, 25)". On examining the specimens of tbis 

 species in RAHKNiroiiST's Die Algen Europas No. 1650, I have found tliat this basal disc is a cementing 

 substance, occurring in all the species, of this section. 



12* 



