HALLE, FRUCTIFICATIONS OF CLADOPHLEBIS DENTICULATA. 3 
specimens of a Cladophlebis described by Morris! as Pecopteris 
australis and identified by several authors with the very closely 
allied Cladophlebis denticulata BRGN. sp. On the ground of the 
strueture and arrangement of the sporangia, the species is placed 
in the recent genus T'odea. 
The very great resemblance, in the outward characters of 
the sterile fronds, between the Australian form and the Euro- 
pean Cladophlebis denticulata leads to the idea that at least 
some of the fronds referred to the latter provisional species might 
also be of Osmundaceous affinities. "The fructification of the 
European Cladophlebis denticulata is, however, comparatively 
unknown. It is generally held (cfr Sewarp, 1900), that the fern 
described by W. C. WILLIAMSON in the Fossil Flora of LINDLEY 
and Hurrox (pl. 120) as Pecopteris undans represents the fertile 
frond of Cladophlebis denticulata. WILLIAMSON, in his description 
of the species, states that one sorus is placed opposite to the cen- 
tre of each indentation of the edges of the segments, and that 
one branch of the secondary veins always passes through each 
sorus. In the fig. C of pl. 120 of LINDLEY & HUTTON there are 
seen what appear to be sporangia, placed in one row on each side 
of the secondary veins which are represented as simple. This, 
the type-specimen of Pecopteris undans, differs from the typical 
Oladophlebis denticulata in the very deeply undulated margin. 
Later, Sewarp and 8. O. Forp? figured a fertile leaf which 
is referred to Cladophlebis denticulata. 'The specimen is stated 
to bear resemblance to fertile segments of Todea barbara; but 
as the structure of the sporangia is not known, no definite classi- 
fication is attempted. The probability of an Osmundaceous 
affinity is emphasized, however, in contrast with the doubtful 
attribution previously made of a similar specimen to the Poly- 
podiacee. In the second volume of his Fossil Plants (p. 348, 
fig. 258), SEWARD also places Cladophlebis denticulata under the 
Osmundacee. 
It is this just mentioned specimen of SEWARD and FORD, 
which I have had an opportunity to study in Stockholm. I 
ought to mention that Prof. NATHORST, when he examined this 
specimen in Cambridge, as shown by his drawings, arrived at 
! In: STRZELECKI, Physical description of New South Wales and Van 
Diemen's Land, p. 248, pl. 7, figs. 1, 2. 
? The Anatomy of Todea etc. Trans. Linn. Soc. London. 2nd. Ser. 
Bot., Vol. 6, pt. 5, 1903; pl. 27, fig. 4. 
