330 KESIX-SKCRETIXG CLAXDS IN" SOMK AUSTRALIAN PLANTS, 



In the glaiul head there is greater growth of the fells to one side causing the 

 eceentrieity noted above (Text-tig. 11/'. /( ) ■ This une(|ual lateral growth always 

 occurs in the longitudinal plane of the leaf, and is directed towards the leaf ape.\. 

 Text-fig. 11(7 shows gland in surface view. 



Eremophila latifolia. — In Eremophila hitifoba the general plan of gland de- 

 velopment resembles that of Mi/uponim. Here, however, the liead shield is coni- 

 jiosed of eight cells and shows two distinct forms within the species. 



After the differentiation of the young gland into head and stalk legion, tlie 

 first division which takes place is vertical in th? median plane of the head. This 

 is either followed immediately by a horizontal division forming a second stalk 

 cell, or the latter is postponed until the later head divisions have taken place. 

 From the number of glands found in which a bead shield with full number of 

 divisions is suyiported by a single stalk cell, it seems probable tiiat tliis second 

 stalk division is often omitted. The later divisions in the head are all vertical and 

 according to the arrangement of the walls, give rise to two distinct types of liead 

 shield. 



In one type tlie vertical divisions are formed in a radial manner and result 

 in a subspherical sliield of 8 radiating cells (Text-fig 12«). In the other type 

 two sets of parallel or almost parallel divisions meet the original, median vertical 



Text-fig. 12. — (a-b). Surface view of the two ^laiid 

 forms of Eremophila latifolia. (x 230). 



division at approximately equal angles, and result in the formation of a shield 

 of eight cells arranj^ed in two rows of four (Text-fig. 12J)). 



The relation between these types of gland and that of MiinjicrKm is oli\ious. 

 All the gland cells in EremnphUu latifolia are clu'racterised by the inclusion nl' a 

 clustered crystal of calcium oxalate. 



All text-figures were made at table level, tube at Kit) mm., with tiic aid of 

 Zeiss camera hu-ida and with Leitz objectives 3 and (i, oculars 2 and 4. 



LITERATURE. 



1. Martinet. — "Organes de secretion.'' Ann. Sci. nat.. ser. 5, t. xiv.. 1872. 



p. 1()8, PI. 15. 



2. Radlkopeu. — "Ueber die Gliederung der Familie dcr Sapindaceen." Sitz. 



k.b. Akad. Wiss. Munchen, xx., 18!)(), pp. 105-379. 



3. Solereokr. — Systematic Anatomy of the Dicotyledons. \"ols. i. and ii.. IIHIH. 

 *4. Van Tiegiieji. — "Appareil secret, dans les Com]iositae." Hull. Soc. I'.ot. dc 



France, 1883, pp. 310-13; 1884. pp. 112-1 Hi. 

 *5. V(x;l.— Sitz. k. Akad. W'wn.. xlviii., Abt. 2, 1S(i3, p. ti88. 

 6. VOLKEXS. — "Ueber Pflanzen mit lackirtcn P.laltern." Per. Deutsch. Hot. 



Oesell.. viii., 1890. pp. 120-140, PI. viii. 

 *7. VuiLLEMix. — "Appareil secret, dans les t'ompositac." Bull. Soc. Hot. de 



France, 1884, pp. 108-10. 



•The works marked thus were not directly accessible to the writer. 



