80 



A SYNOPSIS OF THE VEGETABLE KINGDOM. 



32. Sori double extending to both sides of vein 



XXXVi. DiPLAZIDM. 



Sori single on the veins 33. 



33. Indusia opening toward each other in pairs.... 



XXXVi. PHILLITIS. 



Indusia all opening toward the end of pinnm or 

 segments xxxvii. Asplenidsi. 



34. Indusia superior attached by a central stalk or 



b.v a sinus (naked in Pheyopteris and Menis- 

 ciuin), normally dorsal : Ivs. not jointed to the 

 root-stock (Tribe Drijuptciidew) 35. 



Indusia extrorse or cup-shaped, normally mar- 

 ginal : Ivs. jointed to the root-stock in most 

 genera (Tribe Davattiew) 4'2, 



Indusia inferior attached under the sorus and 

 opening laterally or by splitting radially into 

 lobes (Tribe Woodsiew) 40. 



Tribe Dryopteridem. 



35. Indusium present 36. 



Indusium wanting 4U. 



37. Indusia on the ends of veins which project be- 



yond the margin of the leaf, .xxxviii. Dbpari.v. 

 Indusia dorsal 38. 



38. Indusium cordate or reniform attached by the 



sinus xxxix. Dhyopteris. 



Indusium orbicular, peltate, attached by a cen- 

 tral stalk Xl. POLYSTICHUM. 



Indusium oval, fixed to a central elongate recep- 

 tacle Xli. DiDV.MOCIIL.ENA. 



39. Indusium cordate or reniform, attached by the 



einus xlii. Sagenia.* 



Indusin peltate, attached by a centran stalk : 

 veins forming small areolte. .xliii. Cyrto.mium. 



41. Main veins joined by arches which bear the 



curved sori xlv. Meniscicm. 



Sori round, attached dorsally. .xlvi. Gomopteris. 



Trihc Davalliew. 



43. PinniE jointed to the rachis : Ivs. simply pinnate : 



indusium circular or reniform 



xlvii. Nephrolepis. 



PinniB not jointed to the rachis ; Ivs. joined to 

 the root-stock 44. 



45. Leaves jointed to the scaly root-stocks 46. 



Leaves not jointed to the root-stocks 47. 



46. Indusium tubular 1. Davallia. 



Indusium broader than long, forming a boat- 

 shaped cavity on the edge of the segment 



11. LOXOSCAPHE. 



47. Indusia near the end of unmodified leaf-lobes. .48. 

 Indusium united with the modified leaf-lobe to 

 form a complete cup lii. Dennst.edtia. 



48. Sorus formed on receptacles containing vascular 



tissues liii. Microlepia. 



Sorus not formed on a special receptacle 



I iv. Stenolom A. 



• This genus is now merged witla Tectaria. 



Tribe Woodsiew. 



49. Leaves uniform, plane ; veins free til. 



Leaves dimorphous, the sporophylls closely rolled 



together 50. 



50. Leaves in crowns: veins free....lv. M-itteuccia. 



Leaves scattered : veins anastomosing 



Ivi. Onoclea. 



51. Indusium underneath the sorus, breaking up into 



stellate lobes Ivii. Woodsia. 



Indusium extrorse, opening laterally with a 

 hood-like lobe Iviii. Cystopteris. 



XI. CiLEicHENiACE.?':. Sporangia sessile or very 

 short-stalked, more or less wedge-shaped, grouped in 

 small flattish groups of :i-8, with a transverse ring, 

 opening vertically. Branching normally dichotomous. 



Contains 4 genera, a single one in cultivation 



i. Gletchenia. 



XII. Cyatheace.e. Mostly tree terns with erect 

 caudes crowned by a cluster of leaves : sporangia 

 sessile or short-stalked, cuneate-oval. with a complete 

 or nearly complete ring, opening transversely. Con- 

 tains 7 or more genera. 



1. Sori borne on the apex of veins : indusium extrorse, 

 formed of a more or less modified marginal tooth 

 and an inner lid-like scale {Tribe Dicksonice) : -". 

 Sori borne dorsally on the veins or at a fork : In- 

 dusium inferior or wholly wanting. (Tribe Cyath- 

 ex) 3. 



2. Tooth of spore-bearing segment scarcely modified, 



about the size of the inner scale..!. DirKSONiA. 



Tooth of spore-bearing segment strongly modified, 



coriaceous like the inner scale and usually larger. 



ii. ClBOTIUM. 



3. Indusium present, inferior 4. 



Indusium wanting iii. Al.sophila. 



4. Indusium at first enclosing the globular sorus, re- 

 maining cup-shaped or irregularly splitting at 



maturity iv. Cyathea. 



Indusium membranous, semicircular, more fully en- 

 closing the sorus v. IIemitelia. 



XIII. Salvini.ace.e. Floating plants with a more 

 or less elongated axis and 2-ranked ivs. : Spores 

 borne within sporocarps of two sorts ; one bearing 

 macrospores, and the other bearing microspores. 

 Contains 2 genera. 



Leaves minute, numerous closely imbricated : 

 sporocarps of 2 kinds, the larger globose, the smaller 

 ovoid 1. AZOLLA. 



Leaves larger, fewer distinct ; sporocarps uniform, 

 globose ii. Salvinia. 



XIV. Marsileace.e. Perennial plants growing In 

 mud, sporangia borne in sporocarps which are 

 stalked and containing both macrospores and micro- 

 spores. Contains 3 genera ; only one in cultivation. 

 i. Marsilea. 



XV. Equisetace«. Rush-like plants consisting 

 of a mostly hollow jointed stem with sheath-like 

 leaves at the joints, spores produced in sporangia 

 under shield-like disks which are grouped together 

 in spikes at the end of the stems. Prothallium 

 green, variously lobed. Consists of a single genus. 

 i. Eqhisetdm. 



XVI. LYCOP0DIACE.E. Moss-Ilke terrestrial or epi- 

 phytic plants with small lanceolate or subulate leaves 

 in 2-4 or more ranks: Sporangia 1-3 celled, solitary in 

 the axils of ivs. : Spores of one sort, minute. Prothal- 

 lium mostly subterranetin. Contains 2 gcuei-a. only 

 one in cultivation i. Lycopodidm. 



XVII. Selaginellace.e. Moss-like terrestrial 

 plants with subulate or oval scale-like leaves in 4 

 or more ranks. Sporangia In the axils of the 

 leaves of two sorts. Macrosporangia containing four 

 microspores and microsporangia containing numerous 



minute microspores. Consists of a single genus 



i. Srdaoinella. 



