248 



mains of the free ends of the filaments are still visible at the border of the ostiole. 

 On the other hand it is certain that a crown is not always developed, for ripe and 

 emptied cystocarpic conceptacles may be found in which the structure of the ostiole 



agrees exactly with that of 

 the young conceptacles 

 shown in fig. 167 A, and 

 which show no trace of a 

 shed crown. 



As will be seen from 

 the above, this species dif- 

 fers from M. Lejolisii, besides 

 the characters named by 

 FosLiE, principally by the 

 thicker roof of the sporan- 

 gial and cystocarpic con- 

 ceptacles, and by the cen- 

 tral part of the roof con- 

 sisting of long converging 

 articulated filaments, some- 

 times projecting outwards 

 as a crown, and further by 

 the structure of the antheri- 

 dial conceptacles, the sper- 

 malia being not produced 

 at the end of long sterig- 

 mata. 



I refer to this species 

 Ihe specimens from Nyko- 

 bing. Mors referred by 

 FosLiE with doubt to Me- 

 lobesia farinosa f. borealis 

 (Foslie, Remarks, p. 98). 

 Foslie did not find any he- 

 terocysts, but I found some 

 intercalary trichocytes with 

 or without cortical cells, as 

 described above, thus different from those of M. farinosa, in which they are terminal. 



All the specimens referred to this species were growing on Alga?, particularly on 

 Fucus vesiculosiis, thus all the specimens found in the Limfjord, otherwise on Chondrus 

 crispus, Rhodymenia palmata and Laminaria digiiata. In the Limfjord it was always 

 found growing together with Lithophyllum macrocarpum. Sporangia, antheridia and 

 cystocarps were met with in August and September. The species is certainly annual. 



D 



Fig. 167. 



Melohesia liniitala. Vertical sections of lemale conceptacles. A. young stage 

 vvltli unfertilized carpogonia. B. fully (ievelo|>e<l cystocarpic coneeplacle 

 with well develo|>eil <-ro\\ n consisting of articulated filamenls. C, fully de- 

 veloped cystocarpic conceptacle in the stage of emptying; the crown lias 

 perhaps been thrown oil'. From Anitoft Hev. A, C, D Ii50:l. II (ioO:!. 



