Tangles of Trichomes. 8 7 



In many cases the protecting trichomes do not, as 

 in the above instances, form "weels" — that is, rows 

 of straight close-lying processes in form of fringes, 

 hairs, and staves — but are simply tangles, that is, 

 irregular bundles of soft hairs, which block up the 

 tubular or funnel-shaped entrance of the corolla-like 

 plugs of wool; plugs, which entirely exclude all 

 smaller weaker insects, and such as have but a short 

 proboscis, while they in no wise prevent the larger 

 stronger species, with long proboscis, from access to the 

 spaces beyond them. This kind of formation, again, 

 is found sometimes on the inner surface of the peri- 

 anth, sometimes on the andrcecium, sometimes on the 

 gynsecium, and, lastly, sometimes on more than one of 

 these parts in one and the same flower. In Menyanihes 

 irifoliata (Plate II. fig. 70, longitudinal section of flower), 

 in Lycapus, Thymus, Galaminfha alpina, Paederoia Bona- 

 rota, and P. Ag&ria, Primula minima, Lonicera semper- 

 virens, Arctostaphylos alpina, and A. uva ursi (Plate 

 III. fig. 110, longitudinal section of flower), Geranium 

 palustre, and many other flowers, it is the corolla which 

 is the seat of the formation, the interior of this being 

 covered with a fleecy tangle of trichomes, which 

 extends either over the entire surface, or is limited to 

 the lower and narrower part above the nectar-cavity. 

 In Geranium sihaticum, Rhododendron hirmtum, and 

 P. ferrugineum, Lonicera nigra, L. xylosteum, and L. 

 alfigena (Plate III. fig. 9 6, longitudinal section of flower). 



