40 J. H. MAIDEN. 
matter which must not be confused with the subject of 
staining. Many saprophytes and root parasites dry black, 
e.g. Monotropa (Monotropacez), Gerardia (Scrophulari- 
aces), Comandra (Santalaceze). Some Veronicas, appar- ~ 
ently not root-parasitic dry black, as also do some Utricu- 
larias. In Zygophyllum there is some stain, but this 
apparently emanates from the juice only of the succulent 
plant, and this belongs to a different class of phenomena. 
I submit to you alist of a few plants (arranged iu natural 
orders alphabetically) which I have observed as having 
stained paper in my own herbarium. The list is too small 
for me to deduce much as regards botanical relationships ; 
it may be added to as search in this and other large herbaria 
will undoubtedly being forth many additional instances. 
BIXACEA. 
Scolopia Gerrardi, Harv. (South Africa). 
Oncoba spinosa, Forsk. (Arabia). 
Azara microphylla, Hook. (Chili). 
These plants, from widely different countries, produce a 
greenish-grey, greasy looking stain, the Scolopia and the 
Azara very abundantly, the Oncoba to a less extent. 
BORAGINACEA. 
Alkanna tinetoria, Tausch. 
The root produces a purple stain, the weil known alkanet. 
COMPOSIT. 
Helichrysum baccharoides, F.v.M., Australia. 
The whole plant produces a red to purple blush. 
CONVOLYVULACE. 
Ipomecea heterophylla, R.Br. 
The young leafy tips of this Australian plant produce a 
reddish-brown stain. . or 
