74 



Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 



4. Liagora pinnata Harv. 



Harvey, W. H., Nereis Bor.-Americana, part II, 1853, pag. 138. Agardh, 

 J., Epicrisis, 1876, pag. 517; Analecta Algologica, Contin. III, 1896, p. 108. 



The piants (Fig. 76) I have referred 

 to this species seem to accord well with the 

 description and figures of Harvey (1. c.) 

 even if they show some differences. 



Harvey describes the frond as three 

 inches long ; my specimens reach a length 

 of up to 16 cm. The stems are set at 

 short intervals with branches, spreading 

 out on all sides longest in the middle of 

 the frond, shorter upwards and down- 

 wards. These branches bear again branch- 

 lets placed in the same manner and the 

 branchlets again ramuli. Harvey says 



Fig. 76. Liagom pinnata ^-j^^^^ ^j^g ramuli are "often opposite" but 

 Harv. Part of a plant. , . , .,, ^ 



(About 3 : 1). this does not agree with my observations. 



For the rest I refer to Harvey's 

 good description of 

 the dried plant ; his 

 comparison of the 

 very uneven surface 

 with "pepper and 

 salt" is very strik- 

 ing , darker red- 

 brown dots protru- 

 ding over the whitish 

 coating originating 

 from the upper end 

 of the assimilating 

 filaments and cysto- 

 carps. 



The central nearly 

 or quite colourless 

 filaments in the thal- 

 lus consist of long 

 more or less cylin- 

 drical cells tapering 



usually somewhat near their ends (Fig. 77 a) ; these cells are 

 about bOju thick and about 8 times their own length; but some 



Fig. 77. Liagora pinnata Harv. a, assimilating 



filament w^ith carpogonium and antheridia, b, 



part of an assimilating filament with antheridia 



(a, about 60: 1; b, 160:1). 



