145 



•cylindrical, or slightly tapering, about 1.5 mm. thick, seldom a little 

 more, with rounded or slightly spherically thickened ends, which 

 in old specimens often are somewhat denudated. Pl. 21, fig. 4. 

 Especially the branches of the last order frequently bear numerous 

 wart-like processes or short branchlets, which often are very den- 

 sely crowded at the apex, forming smaller and denser or larger 

 and more remoted bundles. These bundles are rather irregular, 

 often subglobose, occasionally obpyramidal and neaiiy truncate. 

 Pl. 21, fig. 2. The branch-systems are often more or less ana- 

 stomosing, particularly if much attacked by animals. 



In structure it very nearly agrees with the preceding spedes, 

 frequently with rather more distinct cup-shaped layers of tissue, 

 and the cells are of the same size as in the latter. 



The conceptacles of sporangia I have seen only in two spe- 

 cimens (pl. 21, fig. 3 and 6) and in small numbers, most of which 

 apparently not fully developed and others emptied. They are rather 

 crowded in the upper part of <he branches, convex but very little 

 prominent, seen from the surface 300 — 350 [i in diameter. The 

 muciferous canals appear not to be very numerous. The sporangia 

 are tetrasporic, 130 — 180 \x long and 50 — 80 p- thick. 



The cystocarpic conceptacles occur ■ in other individuals than 

 the first named organs. I, however, have seen but very few in 

 a solitary specimen (pl. 21, fig. 5), and in another, but rather un- 

 certain one, that apparently is anastomosed with L. congregatum. 

 They are conical but rather low, abruptly ending in a short and 

 thin tip; but apparently now and then somewhat approaching those 

 of the named species in shape, about 500—600 />- in diameter at 

 the base. I have not seen the carpospores. 



Nor did I in this species meet with overgrown conceptacles 

 of sporangia, but I am not sure whether they in fact do not grow 

 down into the frond, as the conceptacles of cystocarps are super- 

 ficial and both organs do not appear in one and the same individual. 

 Sears after emptied conceptacles of sporangia I found effaced by 

 local formations of tissue, but on the other hand I have not seen 

 such on a section overlapped by a new thickening layer of the 

 frond. 



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