SCIRPUS TABERNAEMONTANI Gmel.? 



PL II, fig. 27. 



One nut and half of another seem very near this species; but they are not well 

 preserved and have lost the setae. 



Length (with remains of style) 2.2 mm., breadth 1.6 mm. Swalmen. 



SCIRPUS LACUSTRIS Linn. var. 

 PL II, fig. 28. 



Nut elongate obovate triquetrous gradually tapering into the style, attachment 

 broad; setae broken, only the base of one or two remaining, they appear to have been 

 broad; sculpture uniform hexagonal cells, not becoming elongate towards the base. 



Length 3.4 mm., breadth 1.5 mm. Reuver. 



In surface sculpture this nut resembles 5. lacustris, but differs in its elongate 

 shape and is larger. S. lacustris under certain conditions has nuts varying greatly in 

 size and shape, even on the same plant; but we have not yet been able to match the 

 Reuver fruits. 



SCIRPUS MUCRONATUS Linn.? 

 PL II, fig. 29, 30. 



Nuts obovate triquetrous or plano-convex; style usually short and conical, but 

 occasionally longer; setae wanting; surface sculpture of the same character as the last, 

 but cells much smaller and inconspicuous, a few transverse rugosities. 



Length 2.4 mm., breadth 1.75 mm. Reuver. 



This greatly resembles the nut of the living S. mucronatus, which we have there* 

 fore illustrated for comparison (figs. 31, 32); the most noticeable distinction is that the 

 recent plant has the nut more truncate above and not merging into the style. 



SCIRPUS cf. CARINATUS A. Gray. 

 PL II, figs. 33, 34. 



Nut elongate*obovate narrowed below triquetrous with blunt angles, all three 

 faces concave, base of style short conical ; bristles 6 in 2 rows attached to a thick collar, 

 persistent stout broad flat, striate with recurved hooks on the edges, about as long as or 

 longer than the nut; sculpture irregular hexagonal cells becoming elongate towards the 

 base and giving rise to indefinite irregular striae. 



Length 2.75 mm., breadth 1.7 mm. Reuver, Swalmen. 



This species is abundant at Swalmen and Reuver. It is more robust and has 

 stronger setae than the American S. carinatus, but we can find nothing nearer to it. 

 Probably it is an extinct form. 



64 



