26 M. FOSLIE. [1899 



minute (mes densely crowded in other crusts or other parts of a 

 crust-complex appear to be those of antheridia, only about 100 jj- 

 in diameter seen from above. 



With reference to structure, the hypothallic cells are up to 12 

 jj- long, and the perithallic ones are square or somevvhat rounded, 

 often, however, with the. longest diameter in horizontal, now and 

 then in vertical direction, 3 — 5, or 3 — 4 by 5 jj- in diameter. 



The spedes stands near to G. subtenellum, but differs espe- 

 cially as regards the structure, in which respect, however, it stands 

 very near to Lithothamnion tenuissimiim. 



It has been collected in Shimoda harbour (Prov of Izu), and 

 at Otaru, both places on the Pacific coast of m-iddle Japan, l<indly 

 communicated to me by Mr. K. Yendo. No. 66, 194, and 196. 



It is also known from Monterey, California, collected by Far- 

 low, according to specimens in Thuret's (Bornet's) herbarium. 



Lithophyllum craspedium Fosl. mscr. 



From a crustlike holdfast 4 — 5 cm. in diameter issue coarse 

 and irregularly divided branchsystems, in the lower part much 

 confluent with each other. The branches are commonly up\^'ards 

 dilated into more or less compressed, 15 — ^25 mm. broad expan- 

 sions 4 — 6 mm. in thickness, or in their lower part up to 10 mm. 

 thick, now and then slightly lobed. Occasionally the branches are 

 subterete, about 8 mm. thick, with rounded ends. The solitary 

 specimen seen is 16 by 11 cm. in diameter and about 7 cm. in 

 height. It is of yellowish-white colour, here and there with a 

 rosy tinge. 



The conceptacles of sporangia are shown on the surface of 

 the frond as minute, convex knots about 150 /j. in diameter which 

 soon become decorticated. The}^ are on a section 200 y- in dia- 

 meter and at length growing down into the frond. The sporangia 

 are unknown. 



With reference to structure, the cells are on a longitudinal 

 section of a branch pretty regular, frequently about twice as long 

 as broad, or 15—25 y. long by 8 — 11 /j.. 



In habit the species stands nearest to Lithophyllumf?) plciiy- 



