137 



brandi. The further divisions and branchings 1 have not followed; they result in 

 the formation of a glonierule of radiating filaments, the two or three last cells of 

 which are swollen and produce each a carpospore. As each fertile branch bears as 

 a rule more than one carpogonium, the glomerules may perhaps sometimes be 

 composed of two or even three cystocarps, being thus syncarps. The position of 

 the antheridia in the neighbourhood of the carpogonia results in emptied anthe- 

 ridia being frequently visible in ripe cystocarpia amongst the spore-producing fila- 

 ments (fig. 63). 



I have no doubt that Kylin is perfectly right in referring the Rhodochorton 

 chant ransioides to this species, as it agrees with it in all but the reproduction. 

 However, the tetraspore-bearing plants are as a rule smaller, ca. 2 mm. high, and 

 it may be added that they usually form continuous felted coverings while the 

 sexual plants form isolated tufts. On the other 

 hand specimens fully agreeing with those des- 

 cribed by Reinke and Kylin, only bearing mo- 

 nosporangia instead of tetrasporangia, also occur. 

 Young still undivided tetrasporangia are out of 

 the question in this connection, for I have in 

 many cases met with specimens bearing nume- 

 rous well-developed monosporangia , some of 

 which were emptied but not one with divided 

 contents. Usually each plant bears either tetra- 

 sporangia or monosporangia, but the two kinds 

 of plants often grow together side by side, as 

 the plants represented in fig. 64. The only differ- 

 ence is that the monosporangia are smaller than 

 the tetrasporangia. The monosporangia I found 

 (10— ) 11— 18 ;i long, 5— 7 (— 8,5) // broad, the 

 tetrasporangia 15—28 /j. long, 8 — 12,5 /j. broad. 

 Referring to the above quoted descriptions it 

 may be added that two sporangia-bearing branchlets are frequently sitting on one 

 cell in the monosporangia-bearing as well as in the tetrasporangia-bearing plants; 

 they are usually opposite but may also be placed near each other on one side of 

 the filament (fig. 64). 



The species has been met with in the Danish waters in the months April to 

 August. Sporangia-bearing plants occur in April to June, more rarely in July. Sex- 

 organs have been met with in all the months named, fully developed cystocarps 

 only in June to August. This in connection with the fact that the two kinds of 

 reproductive organs occur in different individuals suggest the existence of an alter- 

 nation of an asexual generation appearing in spring with a sexual one occurring 

 principally in summer. If this supposition is right, the germinating plants men- 

 tioned above (fig. 61) must be young sexual plants. Unfortunately Lehmann does 



I), i;. I). Viilensk. SclsU. Slii-., 7. Ha'lihe, nntiii vidensU. ()(■ miilhcni. ACil. VII. 1. 18 



Fig. 63. 



Cludiiransia cfllorescens. 15ranchlet with ripe 

 cystncar]) showing still two emptied antheridia 

 at tlie top of the braiiehlet. ii'i.T:!. 



