251 



312. C. Lyngbyei, nov. sp. Plate IX, figs. 1 and 1'. 



Plantula parva 2 — 4 ctm. vix superans in cæspitibus inter 

 muscos crescens; caulibus cellula basali rhizoidiformi, ramificalione 

 parva et sparsa instruclis, sæpe simplicibus, insertionibus irregula- 

 riter sitis septis sæpe provectis. 



Lat. cell. = 28 //; long. cell. — 5 — 10 plo. long. 



This small Cladophora was found amongst moss gathered by 

 Professor Warming in a ravine near Trangis vaag. Judging from 

 the material coUected it forms clumps of entangled filaments. At 

 first I took it to be Rhizoclomiim as single individuals were not 

 ramified along tbeir greater lengths. But on a closer investigation 

 I found examples witb short or shortish branches here and there. 

 The figure 1 (plate IX) represents different parts of a single plant. 

 Fig. 1 a shows the basal part with the rhizoid-like cell which 

 doubtless serves to attach the plant. This cell has irregularly 

 sinuate walls and is devoid of chlorophyl. Then follows a very 

 long and not ramified filament (a longer portion of it is omitted 

 in fig. 1) consisting of long cylindrical cells, and lastly midway 

 between the base and the apex there occurs a comparatively richly 

 ramified part (fig. 1 b). The starting point of this ramified part of 

 course varies in different examples, being sometimes nearer the 

 basis of the plant, sometimes nearer the apex. But such richly 

 ramified examples seldom occur, in faet branchless ones are far 

 from rare. The ramification is characterized by considerable variety 

 in the situation of the basal wall of the lateral branches, which is 

 sometimes situated at its basis, sometimes — in faet very often — 

 far out on it ^. The starting point of the lateral branch also varies; 

 it may emerge from directly under a cross-wall at the top of the 

 mother-cell, or above a cross-wall at the basis of the mother-cell, 

 or from anywhere between these two points. Over this richly 

 ramified part (fig. 1 b) the plant shown in fig. 1 consists first of a 



^ Cfr. Cladophora profunda Brand. Hedwigia 1895, p. 222, and Brand: Cla- 

 dophora Studien in Bot. Centralblatt 1899, vol. 79. where a full description is given 

 of the peculiar mode of brancliing, which according to Brand is occasioned b}^ 

 what lie terms evection'. Hosen vinge has already partialh^ treated this subject 

 in his: ^'æxtforhold hos Cladophora og Chætomorpha (Bot. Tidsskrift, vol. XVIII, 

 1892). According to the latter paper by Brand — which came out after I had 

 finished writing this paper — it is possible that our species is perhaps a phase 

 of dcvelopement of a species already known, but which species I cannot say. It 

 seems to me at all events that it can hardly be refened to any of the numerous 

 varieties and forms of Cladophora fracta and glomerata mentioned by Brand. 



