ON MONOTROPA HYPOPITYs. 179 
the 
t. As Barka has not yet been thoroughly explored (since the col- 
lection of Della Cella, which laid the foundation for Viviani’s Flore 
Libycze Specimen,” and Pacho’s small co ection, we have only the 
but occurs again in the distant swampy regions of the White Nile.— 
ON MONOTROPA HYPOPITYS. 
By 8. O. Liypsrre, M D. 
Wisurne to contribute to the solution of the interesting question 
an its food 
whether Monotropa Hypopitys is independent or derives its foo from 
ck 
moss-cover included, we find the masses of rhizomes, These rhizomes 
are 6—10cm. long and 2—3 mm. thick, very entangled, pia rly 
xtrem 
ramified, and flexuous, semi-hyaline, yellowish, and e e, 
ee 
* Can this be indigo? And is the blue of some Boleti, which isi y 
brought out by exposure to the air, of the same kind? The cause of some 
osses, as Mnium stellare and Blyttii, Bryum pallens, eneum &o., especially in 
water, assuming a dark-blue colour, is also quite unknown, ‘ 
N 
