OF THE ' CHALLENGER ' EXPEDITION. 105 



close, blunt, distinctly crenated tertiary segments 2 lines broad. 

 Texture thin, but firm. Both surfaces glabrous, the lower with a few 

 minute bullate scales on the midrib of the tertiary segments. Veinlets 

 12-14-jugate, close, fine, distinct, deeply forked, the lowest some- 

 times bifurcate, Sori placed close to the costa, and a space from 

 the edge, with a distinct space between each, sometimes 12-15 to a 

 segment, absent from the upper third of the segments. 

 Island of Wolsau, Aru group. 



A fourth tree fern, from the island of Ternate, probably new r , is 

 not in fruit ; and therefore its genus is uncertain. 



63*. Hymenophyllum (Leptocionium) polyodon, Baker, n. sp. 

 Rhizome wide-creeping, filiform, lanose. Stipe f-2 inches, filiform, 

 flexuose, fibrillose. Lamina lanceolate, tripinnatifid, 2-3 inches long, 

 |-1 in. broad. Pinnae 8-12-jugate, rhomboid or lanceolate-rhomboid, 

 parallel with the rachis on the upper side at the base, cuneate-trun- 

 cate on the lower side, the central ones the largest, \ inch broad at 

 the middle, the lower ones reduced. Ultimate segments 10-15 to 

 a pinna, ligulate, close, -|— 1 line long, bordered by regular, numerous, 

 minute teeth. Sori one to each pinna, terminal on a side segment of 

 the lowest anterior pinnule. Involucre turbinate, a line deep, the 

 very base immersed in the lamina ; valves toothed at the edge, free 

 nearly to the base ; receptacle exserted. 



Admiralty Islands. 



Intermediate between II tunbridgense and multifidum. 



Trichomanes Motleyi, V. D. B. 

 Admiralty Islands. 



* 



T. peltatum, Baker. 

 Admiralty Islands. 



Known before only in Samoa and New Caledonia. 



T. PYXIDIFERUM, L. 



Aru Islands. 



T. humile, Forst. 



Ternate and Admiraltv Islands. 



* 



T. Filicula, Kaulf. 



Admiraltv Islands. 



T. javanicum, Blume. 

 Admiralty Islands. 



Davallia heterophylla, Sm. 9 var. nervosa, Baker, var. nov. 



Differs from the type by its crispate lamina and much more 

 conspicuous veins. 



LINN. JOURN. — BOTANT, VOL. XV. X 



