17. TIUCUOJIANES, FEEA. ( 71 



pinnatifid pinnules more than \ in. 1. Doubtless it is a distinct species ; but I have not 

 seen the fruit. 



69. H. denticulatum, Sw. ; st. 1-2 in. 1., erect, naked ; fr. ovate-triangular, tri- 

 pinnatifid, 2-3 in. 1., 1 in. or more br. at the base ; rachis margined throughout, 

 with a slightly undulated wing ; pinnae slightly crisped, the lower ones rhom- 

 boidal, twice as broad as long, deeply cleft, with flabellate or pinnatifid linear 

 segm. ; son usually single, placed at the axils on the upper side of the pinnae, 

 sometimes recurved ; invol. ovate, divided about two-thirds of the way down, 

 spinose on the back, with serrulated valves. Hk. Sp.l.p. 101. V.D.B.Hym. 

 Jav. t. 29. 



Hab. Moulmein, at 7,000 ft., and Java. A larger and less crisped and more compound 

 plant than H. Neesii. It is beautifully figured, as are the other Javanese forms, by Van 

 den Bosch. 



70. H. Neesii, Hk. ; st. 1-2 in. 1., naked or slightly winged, with a crispate 

 margin on both sides ; fr. ovate, about 2 in. 1., f-1 in. br., tripinnatifid ; rachis 

 winged throughout, the wing and pinnae much crisped ; pinnce with distant 

 narrow simple or 1-3 times deeply-forked deeply-toothed segm. ; sori small, usu- 

 ally single, supra-axillary on the upper pinnae ; invol. subcylindrical below, 

 divided more than halfway down, with 2 acute spinuloso-dentate valves. Hk, 

 Sp. 1. p. 99. 



Hab. Malaya, Ceylon, Java, Borneo, Fiji, and Philippines. It is quite an open 

 question whether this should be considered a Trichomanes or Hymenophyllum. The 

 Philippine plant is Leptocionium aculeatum of Van den Bosch. Valves of the involucre 

 spinose on the back. L. acantftoides and Braunii of Van den Bosch very closely approach 

 this species. 



71. H. sabincefolium, Baker ; st. 1-2 in. 1., naked or slightly winged ;fr. broadly- 

 ovate, triangular, deeply tripinnatifid, 1-2 in. 1., more than 1 in. br. below; rachis 

 margined throughout with a wing which is thickly beset with aristate teeth ; pinnce 

 crisped, the lower ones flabellato-pinnatifid nearly down to the midrib ; the ult. 

 segm. very narrow, 2-3 lin. 1., and deeply cut up nearly to the midrib by numerous 

 strong aristate teeth ; sori solitary, supra-axillary, spinose on the back, divided 

 about halfway down with ovate spinoso-serrated valves. 



Hab. Salak, Java, Zollinger. Allied to H. Neesii and aculeatum ; but here the leafy 

 part is so narrow, and so much cut up by the numerous strongly aristate teeth, that the 

 ordinary appearance of a Hymenophyllum is quite lost, and a frond looks more like a 

 miniature branch of Junipems Sabina. 



GEN. 17. TRICHOMANES, Smith. 



Sori marginal, always terminating a vein, more or less sunk in the frond. 

 tnvol. monophyllous, tubular, closely corresponding with the frond in texture, 

 the mouth truncated or winged, or slightly two-lipped. Recept. filiform elon- 

 gated, often considerably exserted beyond the mouth of the yavolucre, capsu- 

 liferous principally at the base. Caps, sessile, depressed, surrounded by an entire, 

 broad, nearly transverse ring, bursting vertically. The ferns of this genus agree 

 with those of the last in habit of growth and delicacy of texture, the character furnished 

 by the shape of the involucre dividing a very natural tribe into two nearly equal ' 

 halves. Ihe geographical range of the species is very similar, as is the range of 

 variation in size and circumscription of frond. TAB. II. f. 17. 



Feea. Sterile and fertile fr. different, the latter consisting of a narrow disti- 

 chous spike. Sp. 1-i. 



