CHARACTERS OF TRIBES AND GENERA, Ar S 
to differ chiefly in degrees of length and breadth, the whole 
presenting but few obvious points of difference of specific 
value. He also attaches much importance to the different 
forms of the abortive sporangia (paraphyses), the number 
of articulations forming the ring, and the form of the 
sporangia, but much more investigation is wanted before 
these microscopic characters can be made available for 
determining species. The following are the principal 
well-marked species. : 
*Sporangia intramarginal ; Hook. Syn. Fül., t. 6, fig.. 56, b. c. 
Ex. V. scolopendrina (Pteris, Bory; Haplopteris, Presl ; 
Teeniopsis, J. Sm.) (v v.) ; V. falcata, Kze. ; V. Gardneriana, 
Fee; V.stipitata, Kze.; V. stricta, Carm. ; V. lineata, Sw. 
(v v.) (Teeniopsis, Bedd. F. S. Ind., t. 54) ; V. remota, Fée. 
** Sporangia in an extrose slit, margin not involute, 
Hook. Syn. Fil., t. 6, fig. 56 A. 
V. elongata, Sw. (V. zosterefolia, Willd) (v v.); V. ensi- 
formis, Sw. 
Oss.—In the * Synopsis Filicum " this with eight other 
species are included as synonyms of P. elongata. V. strict 
is a native of Tristan d'Acunha, and in general appearance 
is similar to V. lineata, but differs in the short sarmen- 
tum being covered with undulate, crisp squamæ, not stiff 
and filiform as in V. lineata. Specimens collected by 
Griffiths in Bootan have the same kind of crisp squame 
as those from Tristan d’Acunha. 
81.—Prerorsis, Desv. in part (1827). 
Pieris sp., Linn. 
` Vernation uniserial, sarmentum short. Fronds contiguous,  — — 
~ simple, linear acuminate, 6 to 18 inches long, rigid, smooth. _ E 
