412 MR. C. CHRISTENSEN ON THE FERNS OF THE 
This species, which was originally described from plants from the Seychelles, is 
common in all the South-east African islands. The Malayan T. obscurum, Blume, 
is very similar and very likely not specifically different. 
3. HyMENOPHYLLUM POLYANTHOS, Sw.; Baker, Fl. Maur. 462; C. Chr. Ind. 366. 
Mahé, Horne, 146! Gardiner! Silhouette, on trees, 2000 feet, Gardiner! 
Also found in Madagascar and tropical West Africa and widely spread in tropical 
America. A closely allied species, H. Blumeanum, Spr., occurs in tropical Asia. 
4. HYMENOPHYLLUM CILIATUM, Sw.; Baker, Fl. Maur. 462; C. Chr. Ind. 358. 
Mahé, Gardiner! Widely spread in the tropics. 
5. HYMENOPHYLLUM HYGROMETRICUM (Poir.), Desv.; Baker, Fl. Maur. 463; C. Chr. Ind. 
362. 
Mahé, Pervillé, Horne, Gardiner! in jungle anywhere and at any altitude, on trees 
or rocks. Silhouette, Gardiner! 
The species is confined to the South-east African islands. 
CYATHEACE ZA. 
6. CYATHEA SECHELLARUM, Mett.; Baker, Fl. Maur. 467. 
Mahé, Horne, 203! Silhouette, Gardiner ! 
Endemie.—I quote from the labels. Horne says: “Common at and above 1000 ft. 
in Mahé. Trunk in ravines 40-50 ft. Stipe 1-2 ft. Frond 4-9 ft. long, 2-4 ft. 
broad.” Gardiner: “ Part of a tree-fern [from the summit of the island of Silhouette, 
above 2120 ft.]. There are no trunks; the base rising only about 6 in. above ground.” 
Gardiner’s specimen is sterile and may, of course, have been taken from a young 
plant without a developed caudex. It is surprising that Gardiner did not collect the 
species in Mahé, where in 1871 it was common, according to Horne, which suggests 
that it is nearly or quite extinct. {It is still found in the indigenous jungles of the hill- 
tops of Central Mahé, but is disappearing. It was ina press from Mount Harrison 
which went astray —J. S. G.] 
POLYPODIACE X. 
7. DRYOPTERIS srrigosa (Willd.), C. Chr. Ind. 295.— Aspidium strigosum, Willd.; Kuhn, 
Bot. v. Ost-Afrika, 37. Nephrodium tomentosum, Baker, Fl. Maur. 496, pro parte. 
I list this species with some doubt among the ferns of the Seychelles, as I have seen 
only a single, rather scanty specimen from the islands (Horne, 678), determined by 
Baker as Nephrodium tomentosum. It does not belong to the true Dryopteris tomentosa 
(Thouars), but rather to D. strigosa (Willd.), according to Kuhn’s delimitation of that 
species. Still the determination is rather doubtful the basal pair of veins is truly united. 
The species is known from the Mascarenes and Madagascar. 
