MENISCIUM. 



G13 



curve or the centre of the Menisciform vein to the centre of 

 the intro-marginal arch. 



Meniscium triphyllum, PI. CXXXV. Fig. IV. 



Filix precedent, aliquoties minor caespitosa. Frondibus, 3- 

 phyllis, pedalibus, vel soriferis sesquipedalibus, stipitibus 

 pubescentibus, supra canaliculatis. Pinnis oblongo-lanceola- 

 tis, caudato-acuminatis terminali majore, lateralibus alternan- 

 tibus, nec oppositis, ideoque frons potius pinnata, 1-juga cum 

 imparl ; sterilibus irregulariter repandis ut etiam fertiles. 



Frondibus fertilibus duplo triplove minorib. quoad saltern 

 pinnarum magnitudinem, venatio et situs ut etiam forma 

 sororum omnino ut in praecedente venulae venaeque secon- 

 daries ut in praecedente in pagina frondis supera promi- 

 nulae, et ut in eo venula infima quaa in soriferis Menisci- 

 formis in sterilibus, angulata, ita ut 3 angulus oriatur cujus 

 parietes sunt, venae primaries, ut hae venulae, vena composita 

 etiam quam maxime exidens est. 



Cum praecedente hinc illinc copiose occurrit. 



1. The fronds, or at least the pinnae of this genus are, I 

 think simple, the compound vein shews no signs of ori- 

 ginating partly from confluent margins of pinnae, which 

 in some Polypodia it certainly does. Bearing this sup- 

 position out, is the fact that the sinuses of the laciniae 

 are frequently diaphanous, as are likewise those of the 

 serratures etc. when such happen to be present. 



2. This genus is an arbitrary one, it is nothing but a Poly- 

 podium of which the sori are, quoad each vena seconda- 

 ria, utrinque seriata, and which are confluent. 



3. Meniscium delligerum, is a Meniscium, Hemionitis, and 

 Polypodium in one and the same pinna. 



4. From Grammitis it differs only in the sori not being 

 u venulae unicae insidentes." 



5. Species nuperius descripta, praecedento quam maxime 



