Having arrived at the conclusion that the food of plants consists of minute particles of earth taken up by their rootlets, it followed that the more thoroughly the soil in which they grew was disintegrated, the more abundant would be the " pasture " (as he called it) to which their fibres would have access.
This species usually constructs its nest on the bottom, excavating a hollow in which a bed of grass, rootlets or fibres is prepared; walls are then raised, and the whole is roofed over with the like material.
Cinerea; 1 and the galls of a Cynipid, Biorhiza aptera, usually developed on the rootlets of the oak, have been procured also from the deodar.
The plant must be lifted with as little injury to its rootlets as possible, and carefully set into the hole, the soil being filled in round it, and carefully pressed close by the hand.
The root bark is reddish-brown, thin and shrivelled, and there is an abundance of rootlets, which are technically known by the name of "beard."
The bark is thick and furrowed, and of a pale fawn colour internally; the rootlets are few, and the root itself is of larger diameter than in the other kinds.
1, back, and 2, front view; 3, vertical section, showing (b) the endosperm, and (a) embryo; 4, beginning of germination, showing (b) the pileole and (c) the radicle and secondary rootlets surrounded by their coleorrhizae.
But these exceptional and dubious forms do not obtain nutriment by sending rootlets in a rhizocephalous manner into their patrons.
Gerardiae (Lacaze-Duthiers, 1865), sends such rootlets into its host as would justify the term Rhizothoracida.
They are of similar structure in all known Calamarieae, the main roots having a large pith, while the rootlets had little or none.
Their surface is studded with the characteristic scars of their appendages or rootlets, which radiated in all directions into the mud.
Petrified specimens of the main Stigmaria are frequent, and those of its rootlets extraordinarily abundant.