The base of the stem of sympodial epiphytes, or in some species essentially the entire stem, may be thickened to form what is called a pseudobulb. These contain food reserves for drier periods. At their end appear one or two leaves, or sometimes four or more.
Some sympodial terrestrials, such as Orchis and Ophrys, have two pseudobulbs between the roots. One is used as a food reserve for wintry periods, and provides for the development of the other pseudobulb, from which visible growth develops.
In warm and humid climates, many terrestrial orchids do not need pseudobulbs.
Efficient production of protocorm-like bodies and plant regeneration from flower stalk explants of the sympodial orchid Epidendrum radicans
Sep 01, 2002; SUMMARY A simple and efficient micropropagation method was established for direct protocorm-like body (PLB) formation and plant...