lUl 



the sporangium through a narrow opening at its upper end. Alter liberation, which 

 was observed in July, the spores took an ovoid form, thereafter they became glo- 

 bular and llien showed amoeboid movements. 



The germinating spore forms an orbicular basal cell which gives otl' one up- 

 right filament but for the rest remains unaltered for some time (fig. 30 D); later 

 on it forms cells in the periphery whicli grow out in creeping filaments fusing 

 together to a rather large-celled basal disc, wliich produces more upright filaments 

 (fig. 31 C). The original basal cell is for some time distinguishable in the centre 

 of the disc. As shown by Kylin, no downwards growing filaments occur at tlie 

 base of the upright filaments. However, 

 I have once observed two short vigorous 

 descending filaments given off very near 

 the base of an upright filament, and 

 each producing an upright filament on 

 its convex side (fig. 31 D). 



The cliromatophore , tlie form of 

 which Kylin was not able to determine, 

 is shown in fig. 30 wliich was drawn 

 after living plants; it is a parietal plate, 

 often with a lobed margin and witli a 

 large pyrenoid which is also parietal but 

 much projecting inward in the cell. The 

 nucleus often lies at the opposite side of 

 the cell from the pyrenoid (fig. 30 B, C). 



Plants similar to those mentioned 

 above were found at a locality in the 

 Sams0 Waters in September. They were, 

 however, only provided with ripe cysto- 

 carpia and bore no sporangia, perhaps 

 to be explained by the sporangia accom- Fig. 30. 



plishine their development faster than Chantra,isia Thmxta a, amphkarpa. Drawn after living 

 ° plants from Busserev by Frederikshavn. A. plant with 



the CystOCarpS. sporangia and liberated siiores. B, branch with branehlets 



D„P„ • „ f 11 4. i T' > bearing antheridia. a carpogoniuni and sporangia: behind 



Referring for the rest to Kylin S ,he caWmom an emptied sporangium is visible, c, 



description, 1 may remark finally, that ceii with chromatophore, pyrenoid p and nucleus, a-, d, 



., „, , . , , _ _ young plant. .320:1. 



the filaments in my plants were 7,5 — 



9,5 fj. thick, that I have once observed a pair of opposite branches, that the spor- 

 angia were 14 — 16 ( — 11) (j. long, 9 — 11 /y. broad, and that the carpospores were 19 — 

 21/7. long, 11— 12,5 (—14) M broad. 



The main form has been found growing on Polysiphonia uiolacea, Ceramium 

 rabrum, Cystoclonium and Dictyosiphon, with sexual organs and ripe carpospores 

 and monospores in July, with ripe carpospores in September. 



Localities. Kli: Busserev by Frederiksliavn, .July. — Sa: MP, Falske Bolsax, 11 — 13 meters. 



