2 go Ewart . — On the Staminal Hairs of Thesium. 
project groups of rounded cells, fil, and the characteristic interlocking of the seg- 
ments is shown at j. e, outer epidermis ; i, inner epidermis, x 200. 
Fig. 9. Thesium alpinum. Longitudinal section of flower (diagrammatic). In 
this Fig. and in Figs. 11 and 14, the section is taken approximately through the 
median plane, so that in the pentamerous flowers the section passes through the 
centre of the perianth-segment on one side, i.e. that on which the stamen is 
represented, and through the lateral portion of the segment on the other. In the 
flowers with only four perianth-segments (e. g. T. alpinum ), the section passes 
through the centre of both, a, filamentous portion of staminal hair ; has, basal 
cushions of staminal hair ; c, apex of perianth-segment ; e, inner epidermis of 
perianth, above stamen insertion ; f stamen filament ; n, anther; st, style, x 23. 
Fig. 10. Do. Transverse section, through level A-B in Fig. 9. The filamen- 
tous portions of the staminal hairs were necessarily cut off, in consequence of their 
upward direction, but are represented by dotted lines, showing their relative length 
and thickness, as if they had been bent downwards into a horizontal position. 
The vascular bundles are represented by darker shading, das, basal cushions of 
staminal hairs, x 56. 
Fig. 11. Thesium scabrum. Longitudinal section of flower (diagrammatic ; see 
description of Fig. 9). The stamen filament is inclined towards the style. Letter- 
ing as in Fig. 9. fil, perianth-filaments, x 20. 
Fig. 12. Thesium funale. Longitudinal section of flower (diagrammatic; see 
description of Fig. 9). The perianth-filaments, fil, are very long and thick. At 
the sides of the short style and base of the perianth are darkly-coloured cells, which 
possibly function as a nectary, nec. Lettering as in Fig. 9. x 35. 
Fig. 13. Do. View of interior of flower, two perianth-segments being removed. 
The position and extent of the nectary (?), nec, are shown, x 18. 
Fig. 14. Thesium capitulijlorum. Longitudinal section of flower (diagram- 
matic ; see description of Fig. 9). The ‘ hooding ’ of the perianth, c, is pronounced ; 
the perianth-filaments are very long ; the staminal hairs, a, are directed downwards. 
Lettering as in Fig. 9. x 24. 
Fig. 15. Do. Transverse section of flower, through level A-B in Fig. 14. 
The enlarged basal cushions of the staminal hairs form a more or less complete 
ring round the perianth. The filamentous parts are directed downwards or 
horizontally, and are not so liable to be cut away in the section as in T. alpinum . 
f, stamen filament ; b, globule of secretion ; a, cuticle of hair, x 64. 
