97 



worms. Crouan 1. c. quotes the sporangia to be bisporic. Ho- 

 wever, this may probably depend thereon, that he has examined 

 not fully developed ones. Judging from a solitary conceptacle 

 examined they appear in fact to be tetrasporic. I also found some 

 bisporic, but neither the former nor the latter appeared to be ma- 

 ture. The cystocarpic conceptacles are convex or nearly hemis- 

 pherical, 150 — 200 fi in diameter, most frequently very little pro- 

 minent and furnished with a rather coarse orifice, in appearance 

 rather resembling a certain stage of those mentioned under L. 

 polymorphum. I have not seen the spores. 



A specimen that I got from Dr. Borne t under the name of 

 L. polymorphum „cum tetrasporis", gathered at Cherbourg, is 

 nearly related to the above mentioned in habit. The crust is about 

 2 mm. thick, the surface rather irregular, with subhemispherical or 

 irregular but small processes, smooth and rather shining. PI. 18, 

 fig. 10. Seen from the surface the conceptacles of sporangia form 

 in a younger stage very small, shallow depressed-circular points 

 about 20 — 30 //■ in diameter, owing to the dark bottom, a part of 

 the roof, looking as deeper holes, with not or scarcely not depressed 

 edges. Later the edges or a slightly larger part of the surrounding 

 portion than in Crouan's specimens get depressed, and thereby 

 the points are more easily perceptible and even look a little larger 

 than in the latter, but still gradually passing into the surface of 

 the frond. Also the central portion by and by becomes a little 

 larger, as a part of the edges get dissolved, though frequently 

 smaller than in the named specimens, or not more than about 50 

 ft in diameter, but probably not yet fully developed. 



Another but smaller and younger specimen „cum disporis" 

 that I also got from Dr. B or net under the same name and from 

 the same place nearly accords in habit with the former, but 

 partly with an indistinct whitish brim. It bears some few concep- 

 tacles of sporangia nearly coinciding with the above mentioned and 

 most developed ones, but the edges less depressed. I also found 

 but bisporic sporangia, abouth 120 fi long and 50 \j- broad, and 

 some of them even with an apparently fully developed wall, but 

 they were probably not mature. As before mentioned the parti- 



