68 



certain states of A. obtusatum, that no specific value to their cha- 

 racters can possibly be attached. It also appears probable to the 

 author, that what he has drawn together on this occasion as forms 

 of this fern, does not even exhaust the display of its variations. In 

 the ferntree-ravines of Victoria the writer had frequent occasion to 

 truce A. bulbiferum and A. flaccidum into each other. 



POLYPODIUM GrAMMITIDIS. 



E. Br. Prodr. 147 ; J. Hook. Flor, Antarctic, i. Ill ; Fl. Nor. Zeel. ii. 41 

 FI. Tasm. ii. 150 ; Hook. Spec. Filic. iv. 230 ; Mettenius, Polypod. 53 

 Grammitis heterophylla, Labill. Nov. Holl. Plant. Specim. ii. 91, t. 239 

 Xiphopteris heterophylla, Spreng. Syst. Veg. iv. 44. 



On trunks of trees in woods of the Chatham-Islands. Not rare 

 in New in Zealand, Tasmania and the ferntree-country of South-East 

 Australia. 



In a variety, which might be called serriformis, occurringin New 

 Zealand, the fronds are not pinnatisected, but simply linear and 

 toothed in the manner of a segment of the ordinary frond. The 

 form of the sori of Polypodium Australe is not unfrequently alike 

 to those of Polypodium Grammitidis. Thus that plant links the 

 genera Grammitis and Polypodium closely together. It is a frequent 

 companion of P. grammitidis in Australia felix,'and ascends in New 

 Zealand to the glacier-regions. The fronds of P. grammitidis are 

 sometimes fully 1' long. 



Polypodium pennigerum. 



Forst. Prodr. 444; Schkuhr, Farrnkrseut. 17, t. 22; Hook. Spec. Filic. 7; 

 Aspidium pennigerum, Swartz, Syn. Filic. 49 & 250 ; Ach. Kich. Voy. de 

 rAstrol. i. 67 ; Nephrodium pennigerum, Desvaus, according to Hook.l. c. ; 

 Goniopteris pennigera, J. Smith, Gen. Ferns, p. 18 ; J. Hook. Fl. Nov. 

 Zeel. i. 40. 



Common in Chatham-Island on borders of water-courses. 



Pinnse not seldom alternate. 



Polypodium rugosulum. 

 Labill. Nov. Holl. Plant. Specim. ii. 92, t. 241 ; Willd. Spec. Plant, v. 1206 ; 

 R. Brovrn, Prodr. 147 ; Endlioh. Prodr. Fl. Ins. Norf. 7 ; J. Hook. Flor. 

 Nov. Zeel. ii. 41 ; Flor. Tasm. ii. 149 ; Hook. Spec. Filic. iv. 272 (with 

 extensive synonymy) ; Beddome, Ferns of South India, 56, 1. 170 ; P. vis- 

 cidum, Spreng. Syst. Veg. iv. 61 ; J. Hook. Flor. Antarctic. 110 ; Chei- 

 lanthes ambigua, Ach. Eich. Voy. de I'Astrolabe, i. 84. 



Common in woods of the Chatham-Islands. 



