106 
ALGJ5. 
C. Myurum, Suhr.), Ceratothamnion ( G . Pikeanum , Harv.), 
Lophothamnion (L. comatum , n. sp., from Australia), and Aristo- 
thamnion ((7. purpuri ferum, J. A g.). 
(7. Vancouverianum is referred to Pleonosporium, and C. Dasyoides 
to Halothamnion. Spongoclomium , Sond., receives anew Australian 
species, C. Wilsonianum ; Dr. Agardh removes Acrochsetium, 
Spermothamnion, and Lejolisia from the Callithpmnieas. 
In the Cryptonemiacse four new species are added to the genus 
Halymenia, and in the Gigartinese one species — I. Australica — to 
the genus Iridgea. 
Considerable alteration has been made in the genus Kallymenia, 
owing to the examination of a better series of fruiting specimens 
than was previously possible. A new section — Meristea — is 
formed to receive K. rosacea and K. demissa, n. sp., both charac- 
terized by prominent hemispherical cystocarps and lobed and 
laciniate fronds. K. phyllopliora and Cryptonemia Wilsonis are 
now placed together in a new genus Blastophye, allied to Kally- 
menia, but with decompound fronds and cystocarps, with an open 
carpostome. Kallymenia microphylla, J. Ag., is now placed in a 
new genus — Meredithia — while the Mediterranean, K. microphylla , 
Zan., is retained in Kallymenia, Dr. Agardh considering that his 
Meredithia microphylla differs from Zanardini’s plant in the exserted 
apothecia-like cystocarps, the tougher and less gelantinous con- 
sistence of the frond, and the pluriseriate cortical cells. Two other 
species, M. nana , n. sp., and M. poly coelio ides (==K. polyccelioides , 
J. Ag. Epicrisis) are also placed in the genus Meredithia. The 
new genus, Hormophora, is also allied to Kallymenia, but differs 
in its exserted cystocarps and fastigiate, branched and moniliform 
frond, only one species, H. Australica , being described. A Cali- 
fornian plant, having a singular resemblance, both in structure of 
frond and in external appearance, to narrow forms of Rhodymenia 
palmata , but the fruit of which more nearly resembles that of 
Callopbyllis, is placed in a new genus Ozophora, near the last- 
named genus. It is characterized further by the cystocarps occur- 
ing in small erect, incurved ligules, aggregated in the middle or 
near the margin of the fronds. To the genus Hymenocladia one 
new species, H. filiformis , from Australia, is added. Under 
Gloiosaccion a new species from the same country, G. pumilum, is 
described ; Halosaccion hydrophora , Harv., and H. Brownii, Harv., 
being likewise placed there. The genus Chrysymenia has also 
undergone some modifications. The section Leptosomia has been 
raised to generic rank, and now includes Ch. Cliftoni and Ch. 
gelatinosa , whilst (7. planifrons is removed to the section Cryp- 
tarachne, and one new species, (7. Dickieana , from Bahia, has 
been added. To the genus Plocamium one new species, P. 
Sandvicense, intermediate in character between P. Telfairice and 
P. augustum, is added. 
An interesting plant from California, the position of which, 
owing to the tetraspores being unknown, cannot be satisfactorily 
