952 THE JOURNAL OF BOTANY 
oe of G. corneum proper, and in all respects they agree 
precisely with certain Atlantic and Mediterranean specimens, 
fe 
nosekiaes referred to Pterocladia capillacea Born.: Gelidium capil- 
out from Dalmatia (Flora Easicc. Austro- Hungarica, no. : 
neum Lamour 6 clavatum Kuetz., from e (Hohenacker’s 
Micbaalien. no at Pterocladia sore te ea as Palmas, 
Gran Canaria (Miss A . Vickers) ; specimens from Tangier (Schous- 
boe) ; also Desmaziére’ s Pl. Crypt. ed.i. ser. i.no. 2108, and Erb. 
Critt. Ital. no. 359. A search “through the rie Gelidium in the 
British M apillacea, which 
— the distribution of this species to the Cape, ' Ceylon, aims - 
and to Australian waters. The Kew Herbariu 
stil better series ; but all angst aga specimens are atarlle’ wth ae 
exception, to wh hich we refer 
Monsieur EF. Bornet ( Notes te oats: i. 1876, pp. 57-61) was 
the first to recognize that the varieties pinnatum and capillaceum of 
G. corneum belong to the genus Pterocladia, and form a species to 
which he gave the name P. capillacea. He suggests that the 
ting all the Gelidia into one species (G. corneum), but that whoever 
has saiied | in the Gulf of Gascony the different sorts of Gnas 
growing together in thousands without intermingling, w 
difficulty in regarding them as mere varieties; for not fuaty do the 
i times di 
at least (for the fruit of all the species is not yet known) differs 
clearly from the rest in the eskiwe of itscystocarp. Like Pterocladia 
lucida J. Ag. from New Zealand and Ausiralia, it has the placenta 
parietal and the spores in chaplets. It is one of the commonest 
forms—widespread in the Mediterranean and Atlantic Ocean—and 
commonly known as G. cornewm var. pinnata or capillacea. ane 
retains the latter name as much one than the former. fte 
describing in detail the structure of the vegetative thallus with its 
concealed single articulated axial filament (like that of Caulacanthus 
and Gelidium), and the organs of reproduction, including the clini- 
dial cystocarp of Pterocladia, as spree with the diclinidial fruit 
of Gelidium, a states that as an exception two pericarps may occur 
back to back in P. capillaceum, separated by a partition bearing 
spores on both tbin: and with two carpostomes ; but almost always 
the development of placenta and spores is on one side only of 
& 
F as dissone ommend rye slightly differing schemes of classi- 
fication of the Italian Gelidia (Floridee [taliche, ii. 1874, pp. 10-26, 
; Enumeraz. Alghe a Liguria, 1877, pp. 193-4, in which work 
Sie was Se author; Phycologia Mediterranea, i. 1883, 
,in all of which he preferred to maintain the cautious 
aaa a ae attitude of retaining as one of the many varieties 
of G. corneum the species which we have now under discussion. In 
adopting this attitude he was strongly influenced by having found 
diclinidial cystocarps on an Australian form much akin to G. corneum 
var. pinnatum. We have not seen Ardissone’s Australian specimen, 
and, — the short description he gives of it, we are sure that it 
