482 CONTRIBUTIONS n;<>\! 1111. NATIONAL BERBABIUM. 



nerves. The Mini la placed uniformly upon the longed (outer) side of the 

 costal areole; otherwise the reins of the whole frond are of equal rank: all 

 are discontinuous In direction, adjoining only at an angle. The venation thus 

 shows some approach to the type of Dlplaslopels; but In thai genua, as in 

 Hemldlctyum, there are well-developed lateral nervea, lost in ■ network only 

 t"w srd the margin. 

 Species two: 



Holodictyum ghiesbregditii (Fourn.) Maxon. 



Vsplenium ghiesbreghtii Fourn. Ilex. PI. 1: ill. ;»/. 5. i^tl'. 



Described and figured from specimens collected bj Ghiesbreghl (no. 16) on 

 wet rocks, Barranca de Tlacolula, Oaxaca, Mexico, 1842 L3. This number Is 

 represented in the U. s. National Herbarium by a portion of a fraud. 

 Holodictyum finckii (Baker) Maxon. 



Vsplenium flnckii Baker, Ann. Bot 8: 126. L894. 



Described from specimens at Kew, collected in the Distrlci of Oordoba, state 

 of Vera Cruz, Mexico, by Hugo Pinck. Represented in the r. s. National 

 Herbarium by an Incomplete frond recently received from Kew. this showing the 

 areoles to be in Ave or six series, not in four as described by .Mr. Baker. 



Christensen has suggested that 1. flnckii, which apparently was founded l.\ 

 Mr. Baker without regard to the earlier 1. ghi€8breghtii, may be identical 

 with the latter. To this the writer is at present unwilling to ;isscnt. The 

 type of venation in the two type specimens is the same, hut the areoles of fiiickii 



are actually larger and relatively broader; the sorl diverge from the <-osta at 

 a greater angle and are shorter, those of ghiesbreghtii (according to Fournler) 

 even attaining a maximum length of one inch. Vet we refer to flnckii excellent 

 specimens collected from shady situations among rocks in a long deep canyon 

 near Gomez Farias, state of Tamaulipas, Mexico, altitude about ."»•"<» meters. 

 by Dr. Edward Palmer (no. 336), April, p.hit. which differ in their greater size 

 and higher average number of scries of areoles and in having the sori rather 

 less divergent from the costa, this last Character being in the direction of ;/hi< *■ 

 breghtii. Whether the differences noted anion;,' the three specimens are no 

 greater than should he accounted variations within a single species can not he 

 determined with certainty from the material at hand: but it seems reasonable, 

 on the strength of the characters mentioned above, to recognize for the present 

 the two species already described. 



The upper and apical portion of a normal frond of Doctor Palmer's U<>. 396 

 Is shown in PI. I. VI. Fig. 1. The rhi/ome of the plaid, though split in half. 

 lengthwise, yet carries fifteen fronds, which must he about half the original 

 number for the living plant. The fronds are about K) cm. long and taper \ei\ 

 gradually from ahout their middle to a long attenuate base, being narrowly 

 winged down to the rhizome. 



THE IDENTITY OF ASPLENIUM RHIZOPHYLLUM L. 



Three very different elements were merged in Linnaeus in L753 

 under the name Asplenium rhizophyllum. The names under which 

 these have usually gone are: (1) Camptosorus rM&ophyllus^ applied 

 t<> the fern of the eastern United States, (2) Camptosorus sibiricuS) 

 restricted to an Asiatic -pedes, (3) Fadyenia prolifera, for a West 



"Not to he confused with the second Asplenium rhizophyllum of Liuureus 

 (Sp. PI. ed. 2. 1540. L763), discussed at page 19U ol' the present paper. 



