ALGÆ OF TASMANIA, 431 
PoLLExrFENIA, Nov. Gen. 
Frons plana, membranacea, purpureo-rosea, expansa, enervia, 
lacero-fissa, reticulata, e cellulis polygonis formata. Kera- 
midia ovata, apiculata, poro pertusa, pericarpio crasso car- 
noso, e frondis pagina orientia, sessilia v. pedicellata, gra- 
nulis pyriformibus basifixis feta. Stichidia...... nf 
Algee Capenses et Australasice, habitu Nitophylli, structurá 
Dictyomenie affines. 
This genus, founded on a plant from the Cape of Good 
Hope, is inscribed to the Rev. John H. Pollezfen of Bradford 
an accomplished British Botanist and Algologist, who has ex- 
plored the marine flora of the Orkneys with much success. 
Pollexfenia pedicellata, Harv.; fronde latissima dichotome 
laciniata; segmentis divaricatis, longitudinaliter pellucido- 
-Striatis; sinubus rotundatis; apicibus obtusis; kerami- 
diis ovatis, pedicellatis. 
George Town, V. D. L., R. Gunn, Esq.. 1272 and 1274.— 
Frond 4-5 inches long, and about equally broad, delicately 
membranaceous, with an orbicular outline, more or less deeply 
divided in a dichotomous manner; the segments spreading 
and the spaces between them remarkably wide and rounded ; 
the apices obtuse and broad, and the margin flat and without 
teeth. The substance is very thin, highly reticulated as in 
Nitophyllum, and destitute of rib or veins, but the frond is 
traversed through its entire extent with a wide band of 
pellucid longitudinal filaments, which run through its centre, 
and give the appearance, under a pocket lens, of pellucid 
‘Strie. These filaments originate at the base of the frond, 
and radiate towards all the segments, passing through the 
middle portion of each, and evidently supply the place of 
midrib, though they do not assume its appearance. They 
are most obvious towards the apices, which is not generally 
the case with ribs or veins. Colour probably a purplish 
rose red, rather inclining to brownish red in drying. Kera- 
_ Midia abundantly scattered over both surfaces of the frond, 
Ovate, acuminate, borne on stalks as long as themselves. 
Stichidia unknown. It adheres to paper. 
