270 



HARDWICKE'S SCIENCE-GOSSIP. 



[Dec. 1, 1869. 



leaves of the hoary Whitlow-cress {Br aba incana). 

 The most decidedly dendritic hair is that of the 

 leaves of the Mullein {Verbascum Thapsus), which 

 has somewhat the appearance of a miniature tree 



Fig. 939. 

 Verbascum Thapsui. 



Fig. 240. 

 Orohanch e caryophyllacea. 



divested of foliage (fig. 239), or of a Botrytis mould 

 without its spores. 



A curiously-shaped branched hair is taken from 

 the calyx of the Broom-rape {Orobanche caryo- 



Fig. 241. Hieracium Pilose/la. Fig. 242. Mimulus moschata. 



phyllacea), in which the collapsing of the penulti- 

 mate joint (fig. 240) imparts a singular appearance 

 to the hair. The leaves of the Hawkweed {Hieracium 



Pilosella) is very like that of the pappus of some of 

 the Composite (fig. 241), and seems to be charac- 

 teristic of the genus Hieracium. 



Simple jointed hairs are represented by the suc- 

 ceeding figures, of which the first (fig. 242) is taken 

 from the leaves of the Musk plant {Mimulus mos- 

 chata) -. by collapsing of the alternate cells these 



Fig. 243. 

 Primula vulgaris. 



Fig. 244. 

 Plantago lanceolata. 



hairs often assume a beaded appearance. 

 Fig. 243 is derived from the leaves of 

 the common Primrose {Primula vul- 

 garis). A similar hair, more constricted 

 at the joints (fig. 24i), is furnished by 

 the stem of the Ribwort Plantain {Plan- *"'£- 245. 



, 7 7 , \ i 1 ,. , T, adesnantin 



tago lanceolata) ; and a more delicate zebrina. 



form (fig. 245) is taken from the base of 



the leaves of the American Spiderwort {Traclescantia 



Fig. 246. Lychnis Floscuculi. 



Fig. 247. Antirrhinum majus. Fig. 248. Scrophularia nodosa. 



zebrina). A beaded hair, with a pear-shaped 

 terminal joint (fig. 246), may be found lying close to 



