554 
Dr. W. PI. Harvey’s Account of the Marine Botany of 
carpiis per discum frondis sparsis ; tetrasporis in pinnis nidulantibus zonatim divisis. King 
George’s Sound (93) and Rottnest (142). A pretty little species, with the habit oi Herai- 
neura frondosa in miniature; and readily known by its scattered, not marginal, cystocarps. 
232. Rhodymenia corallina, Grev. King George’s Sound and Rottnest (85). 
233. Rhodymenia (Acropefcis) awsfrafe, Sond. Abundant at Rottnest (144). I have gathered both 
kinds of fruit. The cystocarps are in every respect similar to those of Rhodymenia. 
234. Rhodymenia {^Acropeltis') phyllophora, n. sp. ; caulescens ; stipite alato ramoso, ramis in frondes 
pergamenas crassas inferne costa valida evanescente donatas dichotomo-multifidas abeunti- 
bus ; segmentis linearibus cuneatisve, margine incrassato piano; soris maculam depressam 
infra apicem frondis formantibus. Ildb. Rottnest (238). Frond 1-2 feet high, much 
branched; segments ^ inch broad. This is probably the same as Acropdtis phyllophora, 
H. and H., but I have not had the opportunity of comparing it with that plant. 
235. Rhodymenia data, n. sp. ; caulescens; stipite plano-compresso subcanaliculato ramoso, ramis 
in frondes pergamenas inferne subcostatas pinnato-dichotomas abeuntibus ; rachide flexu- 
osa, segmentis alternis linearibus angustis dichotomis erecto-patentibus obtusis, axillis ro- 
tundatis. Rottnest, rare (233). A noble species, two feet high, and much branched, very 
distinct from R. Jlahellifolia, with which alone it can be confounded. 
236. Rhodymenia? oitusata, Sond. Rottnest and Garden Island, common (143). I have not ex- 
amined the cystocarps minutely, and my specimens are not now accessible. I think it 
scarcely of this genus. 
237- Rhodymenia? rosea, n. sp. ; stipite brevi compresso mox ampliato, fronde basi cuneata tenui- 
membranacea flaccida rosea subpalmatifida, segmentis lato-cuneatis varie lobatis, lobisacutis. 
Fremantle, G. Clifton, Esq. I have seen only a single immature specimen, sufficient to estab- 
lish a distinct species, but not to fix the genus. It may possibly be a Rhodophyllis. A 
transverse section shows a double row of large empty cells in the medullary layer, and a 
thin cortical layer of minute cellules. 
Areschougia, nov. gen. {Ilarv. MS. Herl. T. C. D.) Frons linearis, compressa, immerse 
costata, distiche ramosissima, e file centrali articulate et stratis tribus cellularum constituta ; 
stratum medullare e filis articulatis longitudinalibus anastomosantibus laxe intertextis, inter- 
medium e cellulis rotundis majusculis pluriseriatis, corticale e cellulis minimis verticalibus 
formatum. Cystocarpia fronde immersa, inter fila strati intermedii suspensa, reticulo filo- 
rum velata, carpostomio demumaperta, fila sporifera a placenta central! emissacontinentia; 
sporae subrotundai, seriatas. Genus AAaJcZowfa proximum ; differt filo central! articulate, 
et habitu. Dixi in honorem Prof. J. E. Aeeschoug, Upsaliensis, Algologi eximii. 
238. Areschougia australis. Halymenia australis, Sond. PL Preiss. Phacelocar pus australis, Sond. 
But. Zeit. 1845, p. 55. Areschougia ligulata, Harv. MS. olim in Ilerh. T. C. D. Common at 
Rottnest (173). The structure of the frond is very similar to that of Phacelocarpus ; that of 
the cystocarp to Rhabdonia. 
239- Areschougia Laurencia, Harv. in Herb. T. C. D. Thamnocarpus ? Laurencia, H. andH. olim. 
Rottnest, rare (236). I have seen no fruit; but the structure of the frond nearly agrees 
with that of A. australis, and the habit is not dissimilar. 
240. Rhabdonia ? Sonderi, J. Ag. Cast ashore at Fremantle (139). I have not seen fruit. 
