Un corso pratico in botanica : con particolare riferimento ai suoi cuscinetti sull'agricoltura, l'economia, E sanificazione . des notevolmente aumentando la superficie assorbente mediante la loro ramificazione attraverso il suolo, i mycorrizalthreads può eventualmente beneficiare la pianta in altri modi anche, come. I ^ ^s m LA RADICE 77 per esempio, da bringingabout changesche potrebbero aiutare nel lavoro di nutrizione. 87. Epifiti, o airplants. Nel propertsignificato della parola questi non sono parassiti, ma usano il loro host merelyas un supporto meccanico per portarli in relazioni tra i due. TheName, tuttavia, è looselyapplied

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A practical course in botany : with especial reference to its bearings on agriculture, economics, and sanitation . des greatly increasing the absorbentsurface by their ramification through the soil, the mycorrhizalthreads may possibly benefit the plant in other ways also, as. i ^ ^s m THE ROOT 77 for instance, by bringingabout chemical changesthat might aid in thework of nutrition. 87. Epiphytes, or airplants. — In the propermeaning of the wordthese are not parasitic, but use their host merelyas a mechanical supportto bring them into betterlight relations. Thename, however, is looselyapplied to all plants thatfind a lodgment on thetrunks and branches oftrees, whether parasitesor true epiphytes thatdraw no nourishmentfrom the host. Not in-frequently the latter iskilled by them throughsuffocation, overweight-ing, or the constrictionof the stems by closeclinging twiners. 88. Aerial roots aresuch as have no connec-tion at all with the soil orwith any host plant, ex-cept as they may lodgeupon the trunks andbranches of trees for asupport. In other thanpurely epiphytic plants, which get all their nour-. Fk;. 90.—A single strand of TiUandsianxncoiden, a rootless epiphyte belonging to thepineapple family ; better known as the Span-ish moss that drapes the boughs of trees soconspicuously in the warm parts of America.Two-thirds natural size. (Photographed by C.F. OKeefe.) 78 PRACTICAL COURSE IN BOTANY ishment from the air, they are generally subsidiary to soilroots, like the long dangling cords that hang from somespecies of old grapevines; or they subserve other purposesaltogether than absorbing nourishment, as the climbingroots of the trumpet vine and poison ivy. A very remark-able development of aerial roots takes place in the stran-gling fig of Mexico and Florida, which begins life as a smallepiphyte, from seeds dropped by birds on the boughs ortrunks of trees. When it gets well started, the young plantsends down enormous aerial roots, which find their way tothe ground,

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