Notts on Fullen. Bij Lord Arcbary. 511 



the pollen is carried off by insects, and which has been so admirably 

 described by Darwiu. 



The pollen grains of Orchids are oval or spherical. 



Iridace^. — Some species of this beautiful order have spherical 

 (Crocus) others ellipsoid pollen (Iris, Aristca, Freesia, Ixia, some 

 species of Gladiolus, etc.), and there are many intermediate forms. 

 There is only one furrow. 



Edgeworth describes the pollen-grains of Crocus syriacus as 

 smooth ; those of C. canccUaius are granular; in those of G. vermis 

 and C. aureus the granules are produced into short spines. In these 

 two species the grains differ considerably in size. 



The surface is often netted, and in some cases (Thunheryia) 

 spirally ridged. 



Amaryllide^. — The pollen is generally, if not always, ellipsoid, 

 as a rule long, narrow, and pointed ; yellow or orange, and generally 

 bright in colour. The surface is smooth or netted, granular or 

 echinulate, and more or less decidedly viscid. The pollen of Hx- 

 manthus imhescens seen from the side is thickened at the two ends, 

 giving it a resemblance to a leg-bone. 



The stigma is almost always, if not always, papillose. 



DioscoKEACE^. — Tarivus communis, the Black Bryony, has 

 ellipsoid pollen, rounded at the ends, opaque and brown. 



LiLiACE^. — The pollen much resembles that of the Amaryllidese. 

 It is generally ellipsoid, but with more rounded ends. The surface 

 as a rule is more or less strongly netted. The pollen of Camassia 

 is thickened at the two ends like that of Hmnanthus among the 

 Amaryllidese. 



The stigma is almost always papillose. 



JuNCACE^. — The Eushes are anemophilous. 



The pollen of L^'uda campestris (fig. 66) is peculiar; it is 

 spherical, subsiding to an obtusely trigonous form. When placed 

 in water its true nature becomes apparent. The contents separate 

 into four spherical masses, the true pollen grains. It is, in fact, a 

 tetrad still enclosed in its mother-cell. All other species of Luzida, 

 and most, if not all, of Juncus, are similarly constituted. It is 

 remarkable, as tetrads rarely occur in anemophilous species. 



TvPHACEi?!. — The Typhaceffi are also anemophilous. 



The pollen of SpargcLnium is ellipsoid, densely granular, and 

 with one furrow. That of Typha is spherical. 



ARACEiE. — The pollen of our Arum is spherical, and this appears 

 to be the prevailing form in the order. '1 he surface is echinulate. 



Alismace^. — The pollen of Butomvs umhellafus, the Flowering 

 Kush, is ellipsoid, subacute at the ends, with a single furrow. That 

 of Damasonium alisma is a 5-6 sided, hemispherical disk, with two 

 concentric circles of facets round the central one. 



Naiad ace^. — The pollen is generally anemophilous and at first 

 spherical, subsiding into a hemispherical 5-sided disk. 



