INTRODUCTION TO CRYPTOGAMIC BOTANY. 533 



referred to Acrostichacece, but the scattered round or oblong 

 sori forbid this union, Gonwphlebium, combined with Mar- 

 ginaria, has the sori parallel with and near to the costa, so as 

 to form a single or double line on either side ; they are always 

 produced at the tip of the lower veinlet or the free veinlets in 

 the areolee. The sporangia are surrounded by paraphyses, 

 some of which are simply clavate, but others end in peltate 

 scales. In other cases the whole frond is rough, with peltate 

 scales, which are elongated on one side. Similar scales, but 

 elongated in two opposite directions, with intermediate teeth, 

 accompany the fruit. Campyloneuron has the pinnate veins 

 connected by transverse veinlets, little branches from which 

 bear the sori. This is combined with Cyrtophlehmm by Smith, 

 and distinguished from Niphohohis by its smooth fronds and 

 distinct sori. Dictyopteris is distinguished from several sub- 

 sequent genera by having no free veinlets in the areolse. Pleo- 

 peltis has broad, targetlike scales, mixed up with the sporan- 

 gia, performing the functions of an indusium. Phlebodium 

 agrees Yfith. Pleo2)eUis in the angularly or arcuately anastomosing 

 veinlets, producing on their outer side or angular commissures 

 two or more conniving or transversely combined veinlets, which 

 are sjjorangiiferous on their combined aj)ices or line of junction, 

 but the sori are not covered at first with scalea Phymatodes, 

 with which Drynaria is combined, has the sj^orangia si^rinkled 

 with obtuse hairs, elliptic even spores, and the sori seated 

 between the pinnate veins at the tijDS of inconspicuous veinlets. 

 It contains some of the finest sj)ecies of the tribe. Aglao- 

 morplia or Psygmium is remarkable for the sori being placed 

 in the centre of the contracted lobes of the fertile frond, as in 

 the first section. The difference between the lobes of the sterile 

 and fertile fronds is very remarkable. Dryostachys has 

 remarkably large oblong or quadrangular sori, forming a row 

 on either side of the costa, between the veins of the semi-fertile 

 fronds ; the veinlets form a curious reticulate plexus. Dictymnia 

 " has simple coriaceous fronds, with internal anastomosing veins, 

 which cannot be seen without maceration, with large naked 

 superficial sori ;" and Arthropterls has uniserial globose sori 

 terminating the free veinlets of the forked veins, which are 



