STRUCTURE.] DEHISCENCE CONNECTIVE LINING. 347 



as in different species of Erica, when they resemble setse, 

 aristae, or crests. (Plate III. fig. 29.) 



The anthers are attached to the filament either by their 

 base, when they are called innate (Plate III. fig. 27. 21.23.), 

 or by their back, when they are adnate (Plate III. fig. 13.), 

 or by a single point of the connective from which they lightly 

 swing : in the latter case they are said to be versatile. This 

 form is common to all true Grasses. 



When the line of dehiscence is towards the pistil, the 

 anthers are called by Brown anticce, but by other botanists 

 introrsa, or turned inwards : when the line is towards the 

 petals, they are said by Brown to be postica, and by other 

 botanists to be extrorsae, or turned outwards. 



The connective is usually continuous with the filament, 

 and terminates just at the apex of the anther ; but in some 

 plants, as Composites, it is articulated with the filament 

 (Plate IV. fig. 5.). In others it is lengthened far beyond the 

 apex (Plate IV. fig. 6. 9.), now into a kind of crest, as in many 

 Gingerworts (Zingiberacese) ; now into a sort of horn, as in 

 Asclepiads ; now into a kind of secreting cup-like body arti- 

 culated with the apex, as in Adenostemon. Very frequently 

 it is enlarged in various ways. For cases of this kind, see 

 Plates III. and IV. Its being sometimes two-lobed, or 

 forked, has been already noticed (Plate IV. fig. 7.). 



The lining of the anther has received particular illustration 

 from Purkinje, who calls it endothecium, and who has found 

 that it consists of that very remarkable kind of tissue, which 

 has been already described under the name of fibro-cellular, 

 (page 51). According to that botanist the forms of this tissue 

 are extremely variable, the vesicles being sometimes oblong, 

 sometimes round, frequently cylindrical, usually fully deve- 

 loped, or, in some cases, merely rudimentary ; the vesicles are 

 in some species erect, in others decumbent, but in all cases 

 more or less fibrous. (See Plate I. figs. 4, 13, 14, 15, 18> 

 19, 20.). For an elaborate treatise on the subject, see Joh. 

 Ev. Purkinje de Cellulis Anther arum Fibrosis : Vratislavise, 

 1830, 4to; with eighteen plates. 



The stamen deviates in a greater degree than any other 



