' Jt
i
TAB. XXIX.
P H Y M A T O D E S . Presl.
PoLYPODii Sp. L . et Auct. D i p t e r i s . Reinw. P o l y p o d i i Sect. D ry n a ria . Rory. Rr.
M i c r o s o r u m . L in k . A n a x e t u m . Sc/wtt.
Sori globosi, nudi, aut anastomosi venularum au t apici venularum (venulis sæpe
obscuns) inserti— Rhizoma repens v. nodosum. 'FmnAes simplices p innatijidoe v.
pinnatæ. Venæ pinnatæ, internoe, tenues v. elevatæ, costoe/ormes, ramosissimoe.
Venulæ prtmartiE in maculas hexagonoideas subrotundas aut irregulariter parallelo-
grammas lateribus curvatis anastomosantes, secundarioe in maculas minores hexagonoideas
aut parallelogrammas aut subquadratas aut irregulariter angulatas con-
fluentes aut liberoe apice globuhso-incrassatoe clavatoeve, simplices aut fu rca tæ, rectoe,
a u t hamatoe. Presl.
Phymatodes crassifolia. Presl— Polypodium. L — Anaxetum. Schott, Gen. Fil. cum Ic.
M r B row n 's o rig in a l v iew s r e s p e c tin g th e v a lu e o f th e v e n a tio n in F e rn s , firs t em p lo y e d in
th e Prodr. Fl. Nov. Holt., a n d u p o n a f a r m o re e x te n d e d scale as re la te s to th e o ld G e n u s
o f Polypodium, ( b u t wiiich, i t is to be g r e a t ly r e g r e tte d , h a v e o n ly la te ly m e t th e p u b lic
e y e in th e in v a lu a b le “Plantoe Javanicoe Rariores” o f D r H o r s f ie ld ,) h a v e b e en , in a g r e a t
m e a su re c a rr ie d o u t b y D r P re sl, in h is “ Tentamen PteridograpUæ;’ w ith th is difl-erence,
t h a t w h a t M r B row n co n s id e rs as se ctio n al d iv is io n s o r su b g e n e r a o f Polypodium, P r e s l
ra is e s to th e r a n k o f g e n e ra . T h u s Phymatodes, P r e s l, is th e s e c tio n Drynaria o f Poly-
podium, w ith B o r y a n d B row n , e s s e n tia lly d is tin g u ish e d b y tlie v e ry m u ch b ra n c h in g an d
a n a stom o sin g v e in le ts , w ith th e so ri s e a te d a t th e p o in t o f confluence o f th e s e v e in le ts , o r
a t th e a p e x o f a fre e v e in le t, h en c e, I p re sum e , in c lu d in g M r B r o w n ’s s n b g e n u s Phlebodium.
T lie sp e cies th u s r a n k in g u n d e r Phymatodes a re n um e ro u s , a n d P r e s l lias th r e e p r im a ry
g ro u p s . § I. E d ph ym a t o d e s . V e næ in te rnæ a u t e le v a tæ , u im q u am c o s tæ fo rm e s . M a cu læ
om n es a u t sa ltem p r im a riæ h e x a g o n o id eæ o f wliicli Pol. phymatodes, L . (Phymatodes
mdyaris, P r e s l ,) is an e x am p le . § I I . P ie ü r id iü m . V e næ v a ld e e le v a tæ , co stæ fo rm e s.
V e n u læ in te rn æ , ten u is s im æ , sæ p e o b sc n ræ e t p o s t re p o titim m a c e ra tio n en i conspicuæ,
m acu la s h e x a g o n o id e a s v. p a ra lle lo g ram m a s v. ir r e g u la r e s efficientes : _ t o w h ich Is r e f e r r e d
o u r P. crassifoha. T h e c h a ra c te r o f th is d iv isio n w ill a c co u n t fo r th e v en u la tio ii n o t
b e in g r e p r e s e n te d in o u r f ig u r e ; i t is w h o lly in te rn a l. § I I I . D r y n a r ia . V e næ sæp issime
v a ld e e le v a tæ , co stæ fo rm e s. M a cu læ p r im a riæ tra n sv e rs im p a ra lle lo g ram m æ , la te rib u s
( v e n u lis ) c u rv a to .a r c u a tis ; m acu læ s e cu n d a riæ p a rvæ , s iib q u a d ra tæ a u t p a ra lle lo g ram m æ a u t
i r r e g u la r ite r h e x a g o n o id eæ . F r o n d e s c o r l a c e æ .-T l i i s co n ta in s , in tw o su b -se c tio iis. Fol.
irioides, L a in ., P. Wallichn, H o o k , e t G r ., P . quercifolium, L ., &c.
Fig. 1. Portion of the under surface of a frond ; nat. size.—f . 2. Sorus ; m. 10 diam.—/ . 3. Vertical
section of the same ; « , 20 d i a m . - / 4. Sporangia in a young state ; and / S. in a ripe s ta le ; m.
100 diam.—- /. 6. Sporules in a young state ; m. 200 diani.
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