79 



of it easily falls away, or perhaps always towards maturity, and 

 then the conceptacles are depressed conical or nearly hemispherical. 

 Later the whole roof disappears, leaving a cup-shaped scar with 

 somewhat elevated edges, as in most other species. They are in 

 a median vertical section inwards about 400 //■ in diameter at 

 the base, 200 /j. high and the upper portion of the roof also about 

 200 \j- high, the canal intersecting this portion 50 — 60 ^ in dia- 

 meter except towards the tip, where it is thinner. These measures 

 are, however, from the largest conceptacles. The frequently appear 

 to be lower. The carpospores are broadly cuneate, occasionally 

 elliptical or elongated obovate, 120—160 /j. long and 50 — 70 p- 

 broad in the broadest part. 1 ) 



The conceptacles of antheridia are very numerous in some of 

 the specimens collected, scattered or crowded especially between 

 the knobs, and appear in the same individuals bearing conceptacles 

 of cystocarps. They are of the same shape as the last named 

 organs, but smaller, about 200 — 300 jx in diameter at the base 

 and traversed by a canal at the tip. The spermatia are very much 

 varying in shape, however, apparently most frequently rounded- 

 angular and much compressed, about 50 — 60 /j. in diameter. 



Remark on the synonomy. Prof. Far low has had the kind- 

 ness to send me two specimens of his L. fasciculatum. Another 

 one is mentioned under L. fruticulosum. These specimens I without 

 any doubt refer to the present species, and represent a form closely 

 related to f. densa. It only differs by its in part a little thicker 

 crust, and the numerous knobs are more or less anastomosing 

 below and above more often furnished with wart-like processes 

 than in Norwegian specimens. The conceptacles of sporangia ac- 

 cord with those of the named form. One of the specimens is 

 accompanied by and partly anastomosed with L. compactum. 



The plant that Mr. Batters records 1. c. as L. colliculosum 

 at least in part appears to belong to this species, according to 



!) The shape and size quoted in Contrib. II, p. 10 partly refers to the sper- 

 matia partly depending thereon, that the carpospores have not been removed 

 from the conceptacle and thereby mostly not seen fully from the side. They 

 really are much thinner than broad, frequently somewhat convex-concave, 

 and in the conceptacles especially the upper portion more or less bent. 



