421 



Some other specimens, which I have also referred to this spe- 

 cies and which likewise grew near Vaags Ejde, hul epiphytic on 

 Laminaria, have basal hairs only. 



Lastly, some examples occurred on Rhodymenia near Thors- 

 havn which are quite destitute of hairs. These examples have a 

 basal disc which is composed of filaments more or less free along 

 the margin, but grown together towards the centre. The erect 

 filaments shown in fig. 77 spring from this basal disc and are more 

 slenderly built than is the case with those of the hair-bearing 

 form. The plurilocular sporangia are cylindrical and about 5 — 6 /* 

 thick. 



Il is possible that I have here been referring several different 

 species to Myrionema globosum and the last-named examples espe- 

 cially appear to rae to differ rather widely from it; nevertheless 

 I think for the present we are justiiied in keeping them together. 



This species has been found in the littoral zone as well as in 

 the sublittoral in shallow water in fairly exposed situations. It 

 grows as an epiphyte on different larger algæ. 



Sporangia -bearing specimens were met with in April, May 



and June. 



Found hitherto in the following piaces: — Str. : Thorshavn and 

 Arge on Rhodymenia palmata(f); Sj'd.: Frodebo on Himanthalia lorea(\); 

 Vaags Ejde on Himanthalia and Laminaria (!). 



99. M. speciosum nov. spec. 



This plant (fig. 78) consists of a basal disc (fig. 78, h) composed 

 of one layer of cells whence proceed erect filaments. The basal 

 disc has a distinctly marginal growth (fig. 78, g) and is composed 

 of filaments which are loosely connected along the margin, but 

 towards the centre are grown together to a pseudo-parenchymatous 

 tissue. The cells in the basal disc are about 8 — 10 \i broad and 

 of variable length, i. e. from about as long as they are broad to 

 2 — 3 — 4 times as long. From some distance within the margin 

 the erect filaments begin to occur and proceed from almost all the 

 cells in the disc. The erect filaments attain to a length of about 

 6 — 800 [i ; at first they consist of a longer or shorter vegetative 

 part, the cells of which are 10 \i thick, and about twice as long 

 as they are thick, and higher up they bear either plurilocular or 

 unilocular sporangia. The plurilocular sporangia vary in form 

 from oblong-ovate to oblong cylindrical, and are usually somewhat 

 curved ; they occur unilaterally and are generally placed close 



