261 



duallj^ overgrown, as far as hitherto seen". It may happen that the emptied con- 

 ceptacles are filled witli filaments growing out from the bottom of the conceptacle, 

 but it also not unfrequently occurs that they are overgrown without being filled, 

 and empty conceptacles are thus found at various depths in the thicker crusts. 

 This was observed with all kinds of conceptacles. 



As mentioned above, I found in one locality (TL, north-west of N. Ronners 

 Rev, 4—5,5 m, Sept. 1894, n" 5341) some specimens somewhat different from the 



Fig. 182. Fig. 183. 



Lithophyllum orbiciilatum Supposed antheridial Lithophylluni orbicnlatum. Cystocarpic conceptacles, A, show- 

 conceptacles. In A small bodies are seen which are ing the pore and the carpogonia. 350:1. B, excentric section 

 probably spermatia. 350:1. showing the inner crown and two carpospores at the peri- 



phery of the disc. 200 : 1. 



ones just mentioned. They form much more expanded crusts, up to 10 cm or more 

 in diameter, and the cells of the perithallium are thicker, 9 — 12/^ broad, 7 — 16(25) /< 

 long. These measurements, however, are only little different from those given by 

 FosLiE, who has also determined these specimens as Lith. orhiculatum forma. The 

 hypothallium consists, as in the other specimens, of a single cell layer, but the cells 

 are frequently elongated obliquely upwards, in the same direction as the perithallic 

 filaments, and they are similar to the cells of these filaments (fig. 180 E, F). The 

 examined crust contained sporangial conceptacles 77 — 122 n in diameter, with a 

 single pore; in an old conceptacle a few not exhausted two-parted sporangia were 

 still present. It must be left to further investigations to determine whether these 

 specimens really belong to L. orbiculatum. 



