162 GRATELOUPIACEAE 
the margins of the median parts of the thallus show an exuberance 3 
of growth which manifests itself іп small crispate irregular lobes : 
or small irregular teeth. Тһе structure of this more dissected 
specimen differs somewhat from that of the fewer-lobed plant, 
the structure of which is very well represented in Kiitzing’s fig. b, 
but we believe that the differences are not important. One of the 
more striking differences is that many of the cells of the medulla | 
and subcortex are nearly empty, while occasional cells are crowded | | 
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cac e 
with granules as in the other form, but this peculiar condition 
may well be due to a translocation of food materials in connection 
with the development of a proliferous habit. 
The procarps or very young cystocarps of Sebdenia limensis 
we have not observed, but the mature and partially grown cysto- 
carps show a well-developed sterile “podium” or multicellular foot 
somewhat as in certain Rhodymeniaceae, and this character 
together with the much firmer cortex were two of the principal 
characters depended upon by Berthold to distinguish Sebdema | 
from Halymenia. In Halymenia Floresia, the type of the genus | 
Halymenia, the cortex bordering the ostiole of the cystocarp is | 
invaginate, while in Sebdenia limensis and in the following species | 
it is plane or slightly elevated. | 
Sebdenia lapathifolia (Kiitz.) comb. nov. 
Halymenia lapathifolia Kütz. Tab. Phyc. 16: 35. pl. 00. 1866. 
Halymenia elongata Kiitz. Sp. Аш. 718. 1849. Not Halymenia 3 
elongata Ag. Sp. Alg. 209. 1822. | 
posed chiefly of filaments 3-7 и in diameter with granular proto- - 
plasts and imbedded in a hyaline mucus, terminating distally ™ 
ellipsoid enlargements 8-14 и in diameter; cells of subcortex ™ 
ner 
surface), the outer smaller, gradually more compact, 4-8 » ™ 
longest diameter; cortex proper very firm and compact, 2-5 cells 
: anticlinal rows or appearing somewhat 
trregularly pseudoparenchymatous in section; the superficial cell 
4-10 и high, 1-2 times аз high as broad, the outer walls thin and 
