FLORA VITIENSIS. 335 
LI 
prolifera, Hook. et Arn. Bot. Beech, p. 108, Sandwich Islands (Barclay! Macrae! Strickland! See- 
mann! Hildebrand!). 8. D. Moorei, Hook. Journ. Bot. 1852, p. 55. t. 3 (Cionidium Moorei, T. Moore, 
Gard. Comp. p. 143), New Caledonia (C. Moore !). 
IV. Dicksonia, L'Hérit. Sert. Angl. p.30. Sporangia apice nervorum imposita, soros globosos 
' v. transverso-oblongos marginales formantia. Indusium duplex, externum membranaceum v. co- 
riaceum, cucullatum, e lobulo frondis reflexo, alterum equitans. Nervi laciniarum indivisi furcati v. 
pinnati, ramis liberis.—Filices caudice erecto v. repente sepissime arborescente, frondibus pinnatis, 
bipinnatis triplicato-pinnatisque.— Balantium, Kaulf. Enum. Fil. p. 228. Culcita, Presl, Tent. 
Pter. p. 135.  Leptopleura, Presl, l. c. p. 186. Cystodium, J. Sm. in Hook. and Bauer, Gen. Fil. 
t. 96. 
l. D. Brackenridgii, Mett. Ann. des Sc. Nat. 1861, p. 81, in not.; stipitibus rachibusque 
hirsutis; frondibus sterilibus tripinnatis, coriaceis, glabris; pinnis lineari-oblongis; pinnulis ob- 
longo- v. lineari-lanceolatis, acuminatis, pinnatifidis, apice serratis; segmentis oblique oblongis, sub- 
acutis, serratis, rachibus secundariis supra fulvo-tomentosis; frondibus fertilibus minoribus, quadri- 
pinnatis, segmentis ultimis contractis, apice subcuspidiformibus, soris pedicellatis—D. Berteroana, 
Brack. (non Hook.) U. S. Expl. Exped. Filices, p. 277. D. thyrsopteroides, Mett.? l.c. p. 81.— 
Viti Levu and Ovalau (U. S. Expl. Exped.; Milne!). Also found in Aneitum (M‘Gillivray !). 
2. D. straminea, Labill. Sert. Austr. Cal. p. 7. t. 10; stipitibus glabris semiteretibus ; frondi- 
bus supra decompositis, flaccidis, glaberrimis; pinnis primariis oblongo-lanceolatis acuminatis, secun- 
dariis triangulatis, acuminatis, inzquilateralibus, basi bipinnatis, medio pinnatis, apice pinnatifidis 
v. grosse serratis; segmentis ovatis subpedicellatis ; soris parvis, sinubus dentium impositis.—Dick- 
sonia Torreyana, Brack. U. S. Expl. Exped. Filices, p. 278. t. 38. Sitobolium stramineum, Brack. 
l.c. p. 273.—Taviuni (Seemann! n. 767; Sir E. Home!, U. 8. Expl. Exped.), Ovalau (M‘Gilli- 
vray!), Vanua Levu (Harvey!). This species has also been found in Aneitum and Eromanga 
(M*Gillivray ! C. Moore! Milne!), and New Caledonia (M‘Gillivray !). 
This species is very different from Davallia dubia, R. Brown (Dicksonia dubia, Gaud. and Hook.), in 
the form of the pinnz, and especially in the form and extent of the divisions in the segments. A few 
scattered long hairs occur in some specimens of D. straminea, but these are very different from the pubes- 
cence of D. dubia. The structure of the indusium makes our species an undoubted Dicksonia, while a care- 
‘ful examination of R. Brown's specimens, and others from Dr. Von Müller, satisfy us that his species is 
rather a Davallia. But indeed the distinction between the two genera is very unsatisfactory, for morpho- 
logically the outer valve in Dicksonia is only the lobe of the segment, which is frequently cucullate 
in Microlepia; and the more or less induration of this lobe is scarcely sufficient to establish generic dis- 
tinctions. 
V. Humata, Cavan. Descr. Plant. p. 272. Sporangia in receptaculo terminali et verticali 
y. subterminali et obliquo imposita, soros rotundatos formantia. Indusia suborbicularia v. oblongo- 
reniformia, basi intus adherentia.—Filices rhizomate repente, hirsute squamoso ; frondibus coriaceis, 
simplicibus, pinnatifidis, pedato-pinnatifidis v. subternatis, venis simplicibus furcatis v. pinnatis, 
ramis liberis.—Pteroneuron, Fée, Gen. Fil. p. 320. Pachypleuria, Presl, Epim. Bot. p. 98. 
* Besides the species mentioned below, the following occur in tropieal Polynesia :—1. Z. pectinata, J. 
Smith, Hook. Journ. 1842, p. 425 (Davallia pectinata, Sm. Mem. Acad. Turin, vol. v. p. 415), from Tahiti 
(Banks and Solander! D. Nelson! U. 8. Expl Exped.). 2. H. pusilla (Davallia pusilla, Mett. Ann. Se. 
Nat. 1861, p. 79), from New Caledonia (Vieillard) and Aneitum (M‘Gillivray!). 3. H. rigida, Carr. ms. 
in Herb. Mus. Brit. (Trichomanes rigidum, Sol. ms. in Herb.), from Ulaietea (Banks and Solander!). 4. 
H. multifida, Carr. ms. in Herb. Mus. Brit., from Aneitum (M‘Gillivray!). 5. H. emula, Carr., Davallia 
emula, Mett. Linnæa, 1869, p. 144, from Aneitum (Mʻ‘Gillivray ! n. 64). 
1. H. heterophylla, Carr. in Herb. Mus. Brit. ; A ample repente, squamoso ; fron- 
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