38 CARL SKOTTSBERG, MAR1NB ALG^ 1. PH;EOPHYCEi£ 



Cladothele, though it must be described as a variefcy or a new species. It grows in 

 more or less brackish water. The growing apex presents a notable feature, being 

 crowned, in most cases at least, by a terminal hair, hut the growth is not typically 

 trichothallic, as intercalary divisions occur here and there in the young monosipho- 

 nous filament. If we examine the older parts, we shall find that the anatomical 

 structure is the same in the two forms; there are four central siphons and the old 

 parts of the aberrant variety has more or less vesicular assimilators, but less conspi- 

 cuous than in the true Cladothele. In both cases their development is secondary, just 

 as in Delamarea. 



The shape of the gametangia is also the same. They are more or less convex, 

 small or large, single or confluent, forming irregular sori. They are more regularly 

 divided into locelli than in Stictyosiphon, in which they were long mistaken for 

 unilocular sporangia. Tims, they are much more like the gametangia in Scytosiphon 

 or Corycus. In the oldest parts of Cladothele they may become almost ectocarpoid 

 in shape (see fig. e— f). 



Both forms of Cladothele have sporangia, unknown in Stictyosiphon (fig. 15 d. 

 n, o). In most cases they occur on other individuals than the gametangia, but there 

 are exceptions from this rule, see fig. 15 n. It is of course not necessary to regard 

 the sporangia as homologous in the two cases. 



While the chromatophores in Stictyosiphon tortilis are few in each cell, having 

 the shape of short lobed bands, Cladothele has numerous small discs, often gathering 

 along the outer convex wall of the assimilators (fig. 15 f). 



Distribution: Fuegia, Falkl., S. Georgia. 



var. striarioides no v. var. — Fig. 15 g — o. 



Csespitosa, ad 6 cm älta et 0,5 mm crassa, rhizoideis perplurimis (ut in typo) 

 affixa. Fröns vage ramosa, ramis alternis vel oppositis vel fasciculatis, apice in pilum 

 longum abeuntibus, partibus junioribus monosiphoniis, crescentia apicali subtricho- 

 thallica et intercalari, adultioribus polysiphoniis, structuram formse typicae prae- 

 bentibns. Pili sat numerosi. Gametangia plus minusve confluentia, cellulis plus mi- 

 nusve protractis circumcincta. Sporangia — interdum cum gametangiis inventa — 

 globosa, 60 — 70 ;j. diam. 



W. Påta g o ni a: Puerto Bueno, sublitoral in 1 — 3 m, on Cladostephus (St. 

 27, 3. 6. 08, sp.); S. Patagonia: Skyring Water, Puerto Altamirano, 5 — 10 m, 

 on Ruppia filifolia and on shells of Mytilus (St. 19, 23. 4. 08, sp. & gt.). — I have 

 already exposed my reasons for bringing this plant to Cladothele. It is a matter of 

 taste whether we regard it as a separate species or give it the rank of a variety. 



Externally it is very like Striaria attenuata f. crinita and also Stictyosiphon 

 tortilis. But the sporangia, which do not form sori as in Striaria, nor are accomp- 

 anied by »paraphyses», serve to distinguish them. Of 15 specimens, 12 bore spor- 

 angia, 3 gametangia and one of these also, in the younger parts, a few sporangia. 

 The hairs are sometimes grouped together; the few plants obtained in St. 27, where 

 the water is less saline than normally but much more salt than in Skyring Water, 



