354 



on the same branch, and that the monospores were really ripe was 

 proved by the faet that branches bearing monospores only also 

 showed nnmerous empty monosporangia. The monospores (about 

 19 p long and 11 broad) are soinewhat smaller than the tetraspores 

 which are about 23 \i long and abont 16 fi broad. Except for 

 the tetraspores, the plant is exaetly like a Chantransia and has star- 

 like chromatophores sitnated round a large central pyrenoid. 



Further, a few tetraspores occurred on a small Chantransia which 

 I have also referred to this species; it grew abnndantly on Cysto- 

 cloninm pnrpurascens from Klaksvig. 



Lastly, I am of opinion that a small, elegant plant which was 

 observed on a conceptacle of Himanthalia Lorea from Frodebo pre- 

 served in spirit ought to be referred to this species (fig. 54); it oc- 

 curred as small, semiglobular, cushion-like growths of the size of 

 a pea, and in the accompanying figure some portions of the plant 

 are shown. As far as I could see, it bore tetraspores only, so I 

 naturally to begin with regarded it as a Rhorfochorton, but on closer 

 examination and after comparison with the above-mentioned spe- 

 cimens it appears to me unquestionably to belong to Ch. virgatnla. 

 The plant has a distinct basal disc whence proceed erect filaments. 

 These are richly branched and the branches are sometimes alter- 

 nate (occasionally more or less secund) and sometimes mostly oppo- 

 site especially in the upper part. The branches generally terminate 

 in short hairs. The branches springing from the lower part of the 

 erect filaments are often prolonged into long branches like the fila- 

 ments whence they proceed, while those occurring higher up gradu- 

 ally become shorter and either bear tetraspores or produce a new 

 series of branches. The oval or obovate tetraspores are sometimes 

 terminal, sometimes lateral, and in the latter case secund or oppo- 

 site, they are about 23 fi long and about 16 /< broad. The fila- 

 ments when thickest attain to a thickness of about 30 n, the thick- 

 ness of the upper part of the filaments and of the branches ave- 

 raging 10 [i. The cells mav be as much as 4 — 5 times as long as 

 they are broad and the thicker cells are usually rather swollen 

 especially towards the top. Judging from the material preserved 

 in spirit, the chromatophores are star-like with a large central 

 pyrenoid. 



As mentioned above, this species comes very near to Ch.secun- 

 data, and they are often difficult to distinguish from each other, 

 as Kuckuck writes to me is also his experience, the faet that both 



