EXPLANATION OF TERMS. 



479 



and most commonly occurring as a 

 bundle-sheath. 



Endogenous, (a) Produced inside another 

 body, (b] Increasing by growth on the 

 inside. 



Endogonidium. Gonidium formed within 

 a receptacle (gonidangium). 



Endophyte. Plant growing inside another 

 plant and parasitic upon it or not 

 parasitic. Comp. epiphyte. 



Endosperm, (a) In Selaginella : tissue 

 formed in the cavity of the macrospore 

 below the prothallium. (b) In Gymno- 

 sperms : prothallium within the embryo- 

 sac (macrospore) ; secondary endosperm 

 may be formed as a nutritive tissue after 

 the prothallium is absorbed. (c) In 

 Angiosperms : tissue formed within the 

 embryo-sac (macrospore) afterfertilisation 

 (commencing by division of the secondary 

 nucleus) and serving for the nutrition of 

 the embryo. 



Endosporium. Innermost coat of a spore. 



Endostome. Portion of micropyle of 

 ovule bounded by the secundine. 



Endothecium. (<z) In Musci : central 

 mass of four rows of cells surrounded by 

 the amphithecium at an early stage of 

 differentiation of the capsule. From it 

 the archesporium is derived in most 

 Musci. (b) In Phanerogams : all the 

 layers of the wall of the mature anther 

 within the exothecium. 



Entomophilous. Pollinated by the 

 agency of insects. See zoidiophilous. 



Epibasal. In front of the basal wall ; said 

 of the anterior half t>f a proembryo. 



Epicalyx. Accessary calyx outside a true 

 calyx. Same as calyculus. 



Epicarp. Outermost layer of a pericarp. 



Epicotyledonary. Above the cotyledons. 

 Comp. hypocotyledonary. 



Epidermis. Layer of cells, covered by 

 and producing the cuticle, forming 

 the outer surface of plants which are 

 several layers of tissue thick except 

 where replaced by cork. 



Epigynous. Upon the top of the ovary. 

 Comp. hypogynous, perigynous. 



Epipetalous. Upon a petal. 



Epiphragm. In Polytrichaceae : a layer 

 of cells stretched over the mouth of the 

 spore-capsule below the operculum. 



Epiphyte. Plant growing upon the outside 

 of, but not parasitic upon, another plant. 

 Comp. endophyte. 



Episepalous. Upon a sepal. 



Episporium. (a) In Peronosporeae : same 

 as exosporium. (b} In Heterosporous 

 Filicineae : special envelope formed 

 around the macrospore. 



Eucyclic. A cyclic flower, in which each 

 whorl has the same number of members 



and the members in successive whorls 



alternate, is termed by Braun eucyclic. 

 Eusporangiate. Having sporangia formed 



from a group of cells. Comp. lepto- 



sporangiate. 

 Excipulum. An outer envelope of apo- 



thecium formed by the thallus. 

 Exine (often written extine). Outermost 



coat (exosporium) of a pollen grain. 



Comp. intine. 

 Exogenous, (a) Produced on the outside. 



(b) Increasing by growth on the outside. 

 Exosporium. Outer (second) coat of a 



spore. 

 Exostome. Portion of micropyle of ovule, 



bounded by the primine. 

 Exothecium. Epidermis of anther. 

 Exstipulate. Having no stipules. 

 Extra-axillary. Beyond or out of an axil. 

 Extrorse. Anther with loculi turned to- 

 wards the outer whorls of the flower is 



extrorse. Comp. introrse. 



False axis. Same as sympodium. 



False dichotomy. Same as dichasium. 



False fruit. Same as pseudocarp. See 

 fruit. 



Fascicular tissue. Tissue of the vascular 

 bundles. 



Feeder. In Gnetaceae : outgrowth of the 

 hypocotyl in some genera, serving as an 

 organ of suction. 



Fertilisation-tube. In Peronosporeae : 

 tube put out by the antheridium which 

 pierces the oogonium and is the channel 

 through which gonoplasm passes from the 

 antheridium to an oosphere. 



Filament. Stalk-portion of a stamen. 



Filiform -apparatus. Longitudinally stri- 

 ated upper end of each of the synergidae 

 piercing and prolonged beyond the sum- 

 mit of an embryo-sac. 



Flagellum. (a) In Schizophyta : whip- 

 like process serving as a motile organ. 

 (b) In Jungermannieae : whip-like 

 branches with small or rudimentary 

 leaves formed endogenously on the 

 ventral surface of a stem. 



Floral leaf. Leaf of the flower. 



Foliaceous. (a) Leaf-like. In Lichens : 

 forms are termed foliaceous in which a 

 leaf-like thallus forms flat often crisped 

 expansions, which can be removed in 

 their entirety from the substratum on 

 which they have grown, being attached 

 to them only in places by rhizines. (b) 

 Bearing leaves. 



Foliar gap. In Filices : a mesh in the 

 vascular bundle-cylinder from the margin 

 of which vascular bundles pass into a leaf. 



Foliose. Bearing leaves. 



Follicle. Monocarpellary unilocular cap- 

 sule dehiscing by one suture. 



