— 90 — 
covering up small extraneous objects partly by scars after emptied concep- 
tacles being irregularly effaced, or the dropped conceptacles leaving small 
elevated edges not dissolved. The crust is in f. minuta frequently but 
30—60 yw thick, in f. stmulans up to about 100 yw thick. 
A vertical section of the crust shows an almost coaxilate develop- 
ment. The hypothallic cells are frequently rather elongated, up to about 
25 » long, sending forth a rather feebly developed perithallic layer. The 
cells of the latter are partly roundish partly square, 7—10y in diameter, 
however often with the longest diameter now in horizontal now and more 
frequently in vertical direction, in the latter case exceptionally up to 14 
long and 7 » broad. 
*The conceptacles of sporangia are scattered or somewhat crowded 
in any part of the crust except the peripherical portion, convex, in f. mi- 
nuta less prominent than in f. simulans, towards maturity sometimes a 
little flattened in the central parts, in the former 300—400 % and in the 
latter 400—500 y» in diameter seen from above. The roof is intersected 
with about 40 delicate muciferous canals. The sporangia are four-parted 
in hoth forms, in f. minuta 60—70 » long and 25—30 uw broad, but in 
f. simulans 140—160 » long and 60—80 yw broad. However, this is 
perhaps not to be considered the average size, as I have examined but 
a couple of conceptacles owing to the scanty material. 
The conceptacles of cystocarps frequently appear in other individuals 
than those of sporangia. They are conical and, as in other species of 
this genus, abruptly passing into a very short and thin tip. Also these 
are smaller in f. minuéa than in f. simulans, in the former 350—450 LB 
in diameter at the base and in the latter 500—600 yp. 
Both forms are provided with the said organs in February, carpo- 
spores however more scarce than sporangia. 
I have been in doubt whether f. simulans ought not perhaps to be 
considered as a separate species, but as I have seen only a solitary well 
developed specimen of this form I do not hesitate to keep it distinct, 
especially since the material also of f. ménuta is scarce and some of the 
specimens no doubt are somewhat stunted. Nor have 1 been able to 
draw any true limit, setting aside the proportionally large reproductive 
organs in the former. But also in other species a great difference as 
regards the conceptacles sometimes is to be seen, for inst. in Lithotham- 
nion laeve. The forms have been found under different conditions which 
not unlikely have had some influence on their development such as for 
instance in the said species as well as L. Lenormandi. 
The present species stands nearest to L. Lenormandi and reminds 
one in habit of young specimens of f. sublaevis. It approaches this form 
also as regards the conceptacles of sporangia, while those of cystocarps 
are different. 
11 naut. miles NW. of Koh Kam on a depth of 10 fathoms (f. minuta) ; 
between Koh Mesan and Cape Liant, 9 fathoms (f. minuta); 15 naut. miles E. 
of Koh Chuen, 10 fathoms (f. minuta?); between Koh Mesan and Koh Chuen. 
15 fathoms (f. minuta); the north side of Koh Mesan in 10—15 fathoms water 
(f. monet); and Koh Sarlak, on Septifer bilocularis L. in shallow water (f. si- 
mulans), — almost everywhere in solitary individuals. 
