61 



are about 120 — 150 or up to 160 ft long and 45 — 60 f* broad, 

 seldom broader. 



The conceptacles grow down into the frond, but overgrown 

 ones are very scarce in the specimens that I have examined, and 

 in most cases I did not find such ones. Also in this species the 

 roof appears apt to fall away, leaving a rather deep scar, which 

 sometimes becomes filled with local formations of tissue. Such 

 filled conceptacles now and then are to be seen on a section, in 

 shape and partly also in size fully resembling not filled ones, and 

 distinctly marked. 



The organs supposed to be cystocarpic conceptacles I found 

 in other individuals than those bearing conceptacles of sporangia. 

 They are comparatively small, conical and rather acute, about 300 

 — 350 fj. in diameter at the base, but probably not fully developed. 

 I have not seen the spores. 



Remark on the synonomy. As mentioned under L. fruti- 

 culosum I consider L. oyssoides Unger not referrible to any form 

 of that species. It appears to me most probably being identic 

 with the species in question, and in all agreeing well with typi- 

 cally developed specimens. On the other hand it reminds one of 

 L. apiculatum f. parvicocca and even certain forms of L. noclu- 

 losum described below, but the latter is in general a larger and 

 coarser plant. 



Relation to other species. This plant forms an intermediate 

 species between L. apiculatum and L. corralloicles. In its typical 

 form it is easily recognised, but it often assumes forms, which 

 in a sterile state are very difficult or nearly impossible to sepa- 

 rate from the one or other of the named species. The reproductive 

 organs are, however, different. As to the vegetative parts it di- 

 stinguishes itself from L. apiculatum f. parvicocca, the most nearly 

 allied form of that species, by its less anastomosing branches and 

 in general more numerous wart-like nodes, but it sometimes even 

 approaches L. apiculatum f. typica in habit. Cp. PI. 15, fig. 27. 

 Now and then it appears to be less densely branched, or the 

 branches even rather spreading, the nodes or short branchlets few 

 in number, and then much approaching L. coralloides f. norvegica.. 



