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TAB. XXXIX.
M E R T E N S IA . Willd. Presl.
Sori dorso medio venulæ superioris (rarissime et inferioris) inserti, globosi, su p e rficiales,
tri-sexcapsulares. Sporangia globoso-pyriformia, sessilia, citissime decidua,
receptáculo punctiformi elevato inserta— Rhizoma repens. Frondes sparsoe,
rarissime simpliciter pinnatæ, sæpissime dichotomæ, ramis hipinnatis, pinnulis
angustis coriaceis. Venæ pinnatæ, uni-hi-trifurcatoe, subtus prominulæ, in marginem
excurrentes, venulis aut divergentibus {in simpliciter fu rca tis) aut parallelis. P in -
milæ aut ad hasin pinnarum desinunt aut in rachide quoque adsunt {decurrunt).
M e nm s ia gigantea. Presl. ( T a b . X X X IX .) —GfeicAema. Wall.
Brown and others unite Mertensia with Gleichenia ; but the two Genera diifer in liabit
as well as in fructification, as we shortly hope to exhibit by figures. The species of Mer..
Unsia are mostly tropical, and the recorded species are with difficulty to be distinguished
one from another.
Fig. 1. Under side of a portion of a frond ; magn. 4 diam.—/ 2. do. of a small portion of the same ;
m. 8 diam.—/ 3. A small portion of do. ; m. 20. d i a m . - / 4. Sporangia in different stages of m aturity,
and in different points of view ; m. 100 diam -f. S. Sporules ; m. 200 diam.
•• f ;
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