7 



cription is taken, but not distinguished by him from the allied species, as to which see Grisebaoh's 

 Flora of the British "West Indies, p. 657, where the identity and synonymy are discussed. 



4. T. sphenoides, Kze. 



Fronds numerous, firm, membranoous, marked with fine lines, } - J in. 1, J - ^ in. br., margins 

 entire or more or less freely split into segments, of young fronds hairy ; outline, base, and stalk vary- 

 ing much ; veins repeatedly forked, fan-shaped, curved from the rudimentary midrib at the base ; 



sori 1 -12 ; 



involucres with rounded lips, immersed or free, receptacle enclosed or protruding. 



Frequent among the lower hills on rocks and banks by rivers or streams. The best character 

 whereby to recognise the species is the splitting of the fronds. T. reptans, Syn. Fil. p. 74. Didymo- 

 glossum laceratum, Fee, Fil. Ant. t. 32. f. 1. T. lineolatum, Hook., is the form figured by Fee. 



5. T. pusilum. Sw. 



Fronds plentiful, of various forms, oblong, or with margins parallel, forked with projecting diver- 

 gent lobes at the top, or more or less fiddle-shaped or pinnatiform, \ - 1 in. 1., 1-6 li, w., thin, cloudy- 

 green, hairy on margins; venation varying with the form of the frond, a simple midrib running to the 

 top, or into the projections, the veins very fine, mostly forked, spreading ; 



sori terminal and single on the lobes, or in the simple fronds the tube of the involucres more or less 

 immersed, lips rounded. Didymoglossum angustifrons, Fee, Fil. Ant. t. 28; f. 5. 



Infrequent, in damp mountain forests. Very variable in form ; the broader and narrower states, 

 looked at alone, might well be thought distinct, but they are seen to run one into the other even on the 

 same root-stock. On referring to Swartz's types and his original descriptions in the British Museum, I 

 find that this and the next species, reptans, had been transposed in books and herbaria ; they are here 

 restored as he used them. 



6. T. reptans, Sw. 



Fiona's copious, irregular in outline, oblonar or lance-sbaped, margin wavy, lobed, or pinnately di- 

 vided to the broad wing of the midrib, ^-2 in. 1., J f in. w , the apex generally abrupt, or in the narrower 

 fronds rounded, the basis tapering to the stalks which are 1-8 li. 1., thin and translucent, pale green, 

 withouc hairs on the surface at any rate in the adult frond, margins hairy ; veins open, simple in the 

 smaller and pinnate in the larger lobes, midrib distinct to the apex; 



tori fi*w or several on the outer or terminal lobes; 



involucres tubular, free or partly immersed, lips conspicuous, rounded. 

 Var. qitercifolitrm, Hook, and Grev. 



More uniform and regularly pinnately divided, reduced at the base, segments 1-1^ li. w., 4-6 li. 1. ; 

 sori clustered at the top of the fronds. 



Abundant on rocks in damp forests at 5,000-6,000 ft. all., both type and variety very variable in 

 form and cutting, but at the same time well individualised and distinct. The colour i3 a pale, rather 

 yellowish-green. 



7. T. Krausii, Hook. & Grev. 



Fronds plentiful, forming large pa'ches, oblong or lance-shaped, 1 - 1^ or 2 in. 1., ^ - 1 in. w. 

 base and apex very little narrowed, without hairs on surface at least in the adult form, membranous, 

 light or dark green, margin hairy in the angles, stalks varying from hardly any to § in. 1., deeply and 

 regularly pinnately divided to the wing of the rachis, or twice-pinnately divided : pinnae copious 

 in. 1., 1 - 2 or 3 li. w. ; veins simple in the lobes ; 



sori terminal, chiefly on the lobes of the upper part of the frond ; 



involucres margined, or the base immersed, but the greater part of the tube free, the lips rounded, 

 conspicuous. 



Common on the trunks of trees by rivers among the lower hills up to 1,000 ft. alt.. This is the 

 most compound of all the foregoing species. It may be readily distinguished from its allies by its 

 larger size, and pinna), regular and mostly toothed or lobed. Hemiphlebium pinnatifidam, V. D. B. 



8. T. membranaceum, L. 



Fronds overlapping in growth, variable and diverse in form, 1-2 in. 1. from q line to 1 or 2 in. w. 

 dark green, without hairs, firm but membranaceous, the margin entire or variously broken, and fringed 

 with minute, circular, membranaceous scales attached by their centres ; stalks short or hardly any ; 

 veins fine, close, repeatedly forked, fan-shaped ; 



sori along the outer margin; 



involucres tubular, more or less immersed, the mouth with two very small lips or none. 

 Common on wet banks and rocks by rivers and streams below 3,000 feet alt., spreading and form- 

 ing large patches. 



The curious fringe of scales is continuous in the barren round fronds ; in the fertile it is placed at 

 slight intervuls. 



9. T. muscoides, Sw. 



Fronds copious, variable in shape and lobing, tapering at the base, rounded at the apex, some- 

 times lobed or tapering, the margins wavy, or more or less deeply lobed; thin and translucent, without 

 hairs ; slulks varying from hardly any to \ in. 1., veins pinnate, open and few, erect-spreading, branched, 

 connecu a by a marginal streak ; 



sori e mfined to the lobes of the outer part of the frond ; 



iir s immersed to the mouth, which is much expanded and indistinctly two-lipped ; recep- 

 tacles protiuding or not. 



Var. major. 



Fronds pendent, 2-3 in. 1., \ -£ in. w. with broadly rounded lobes along the sides, plain and taper- 

 ing at the base to a stalk ^ - 1 in. 1., very pale green, thin and translucent. 



