lines wide, strongly ribbed, simple or once or twice branched, or throwing 
out from the midrib proliferous branches. ranches stipitate, the stipes 
strongly ribbed, the rib continued upwards into the nae and vanishing ; 
crowned with a flabelliform, many times forked, lamina, 3-5 inches long and 
wide. The segments are 3-4 lines wide, linear or alipatiy: cuneate, flat and 
entire at margin, patent, with obtuse apices. Fructification of both kinds 
(on distinct individuals) is borne in the apices of the laciniee. Favelle very 
minute, many crowded together in a sors which is 1-14 lines in diameter, 
immersed, with a perfectly simple nucleus, breaking up at maturity into 
roundish spores. Ze¢raspores in shield-like, terminal nemathecia, cruciate. 
Colour a deep, rather dull, somewhat purplish red or pale vinous. Sudstance 
like that of parchment, rigid when dry. In drying, the frond does not in the 
least adhere to paper. 
When writing the observations given under Acropeltis elata 
(Plate CXXII.), I was not aware that I possessed a specimen of 
A. Phyllophora bearing cystocarps, the want of a knowledge of 
which has hitherto prevented the proper classification of the 
genus. ‘The cystocarps prove to have exactly the structure of 
those of Cryptonemia, next which genus Acropeltis (the Austra- 
lian species at least) must now be placed. Indeed, in general 
habit and structure of frond there is so much agreement gene- 
rically with Cryptonemia, especially with Agardh’s section Acro- 
discus, that I think these two genera might very properly be 
combined. For the present, however, I retain the name dcro- 
peltis until the cystocarps of the original species and those of 
« Acrodiscus”’ shall have been observed. 
Fig. 1. Acropett1s PuyLtLopnora,—the natural size. 2. Apex of a branch 
containing a sorus of many favelle. »3. Section through the same, cana some 
of the immersed favelle. 4. Apex containing a shield-like nemathecium. 5. Sec- 
tion through the same, showing de¢raspores in situ. 6. Two of the ictal 
—magnified. 
