250 THE JOURNAL OF BOTANY 
January, 1904; A. H. S. Lucas, no. 20. Mr. rene on he has 
found specimens eighteen inches square in full s 
Geogr. Distr, Mediterranean, Atlantic, Red Sea Pas ific. 
This appears to be precisely the same as the Australian specimen 
issued by Harvey under the no. 568 
Coprum ELonGatum J. Ag. Farm Cove, Sydney, July, 1901; 
A. H. S. Lucas, no. 
eogr. Distr. Mediterranean, North and South Atlantic, Cape 
of Good Hope, Japan 
TyoTa nigricans J. Ag. Barwon Heads, Victoria, Bass’s 
Straits, January, 1903; no. t, Mr. Lucas found this thrown up 
with wil ae débris 
Geogr. Distr. West Au stralia, Tasmania 
Fig. 1 represents a small portion of the fertile thallus of this 
plant in surface view, as this species has never been figured before. 
It shows the proliferations ns sent poral for the sake of 
comparison with the be speci 
Dictyota prolifican sp. “ko nde subdecomposito-dicho- 
toma, supra a ee sie vel rotundatos segmenta linearia 
elongata inferne sepe angustiora apice rotundata. ert e tota 
plant adultioris superficie (apicibus et marginibus excepti s) phyllis 
minutis dense at sub-gregatim prolifera ; cellulis fertilibus in areas 
maculeformes oblongas conges 
ng Bay, New South Wales, July, 1903, and April, 1900; 
A. H. S. Lucas, no. 22. Queensland, W. dAleock Tully in Herb. 
Brit. Es with antheridial sori 
Lucas, in comparing this species with the ab rnc 
that Ms has found no. 22 only near ne a that the fron 
always smaller, firm, and — while those of no. 14 are ate 
palmatoid, and flexible, and are found in ns Straits. In 22 the 
sori are always large and conspicuous, “?iihe in 14 the fruits are 
mostly single. 
The type-specimen is seven inches long, though incomplete, and 
is of a dark olive-green asere with lighter tips; it is flabellately 
a bearing segments 6-9 mm. wide when dry, 9-13°5 mm. 
whieh i ist. The dicho Sfotlel are 2-4 cm. apart, the branches of 
each Sakoteany slightly diverging above a rotundate sinus. The 
fertile cells are collected into irregular oblong sori scattered over 
both sides of the frond, leaving a bare narrow margin about 1 m 
wide. As the sori develop, linear or clavate proliferations 0-5-2 mm. 
long arise among the fertile cells, and, gradually i eng in num- 
ber and size, cover the thallus, as in D. nigrica In transverse 
section the thallus is seen to be composed of an rages monostro- 
matic layer of large cubical cells enclosed by a monostromatice cortex 
of small coloured cells (three or four of these to each internal cell). 
At the margin of the thallus the internal stratum becomes poly- 
ee thus forming a slightly thickened limb. 
D. prolificans nerg: rather to the larger and broader members 
of the genus than to the smaller and narrow forms. It falls into 
J. Agardh’s subgenus Pusbdephebte because of its aggregated fertile 
