under the first and feebler than it. 
Accessory branchlets do not occur 
in all the female trichoblasts, and in 
some specimens (f. inst. from Thybo- 
ron) they were not met with at all. 
In the ripe cystocarps the orifice 
is enlarged and funnel-shaped, con- 
sisting of large cells (fig. 382). 
The tetrasporangia arise at the 
left side of the trichoblast borne on 
i the same joint; 
they are produc- 
ed by the second 
pericentral cell 
(comp. fig. 377). 
Two secondary 
this cell and the 
Fig. 382. th © : 
e sporangium. ] Il 
Polysiphonia Brodiwi. 1 2 This small ce 
Ripe cystocarp. 63:1. may, however, be wanting, the 
second secondary pericentral cell 
continuing to the base of the article (fig. 383). 
Germination is easily realised in cultures (comp. 
K. R. 1902 p. 342). In August sporelings consisting 
of 6 joints or more and bearing trichoblasts were 
produced in two days. The lowermost article or the 
two first joints produced no pericentral cells but only 
feebly coloured rhizoids. The following one to four 
joints had 4 pericentral cells, the following 5, and 
shortly afterwards joints with 6 or 7 pericentral cells 
appear, the same number which is found in a trans- 
verse section of the lower part of the stem of a full- 
grown plant. As mentioned above, the angle of 
divergence in the sporelings is 1/; of the circum- 
ference. — Abnormal sporelings, showing two op- 
posite rhizoids or two opposite vegetative poles 
were not unfrequently met with in my cultures. 
z Polysiphonia Brodiæi. Female trichoblasts with supernumerary 
pericentral cells branchlets. The figures indicate the branches of the first order 
according to the joints of the primary axis of the trichoblast. 
are cut off from (See texte). À 560 : 1. B 350 : 1. 
most remote of them is usually a little shorter than the other, a 
small peripheric cell being later cut off from the basal cell of 
Fig. 383. 
Polysiphonia Brodiei. Portion of tetra- 
sporiferous plant with branch. 350:1. 
This species has only been collected in the months of May to September. It has 
the appearance of being annual on the Danish shores. In May small specimens 
