6b MORPHOLOGY OF THE ROOT. 



resemble butterflies or other insects ; as, for example, Oncidium 

 Papilio, Fig. 72. Epiphytic orchids are indigenous to the United 

 States only from Georgia to Texas, and only in humble forms, 

 in company with species of Tillandsia, representing Bromeliace- 

 ous epiphytes. The commonest of the latter tribe, and of most 

 northern range, is the T. usneoides, the so-called Long Moss, 

 which, pendent in long and tangled gray clusters or festoons from 

 the branches of the Live-Oak or Long-leaved Pine, gives such a 

 peculiar and sombre aspect to the forests of the warmer portions 

 of our Southern States. 



61. Parasitic Plants have the peculiarity that their roots, or 

 what answer to roots, not only fix themselves to other plants, 

 but draw therefrom their nourishment, at least in part. Among 

 ciyptogamous plants very man} 1 Fungi are parasitic upon or 

 within living plants or animals. But only phaenogamous para- 

 sites are here under consideration. These may be divided into 

 two classes ; those with and those without green foliage. 



62. Green Parasites may be either wholly or partially parasitic ; 

 that is, they may draw all their support from a foster plant, or 



FIG. 72. Oncidium Papilio, and, 73, Comparettia rosea; two showy epiphytes of tin 

 Orchis family; showing the mode in which these Air-plants grow. 



