Authors : Matin Shaikh, Nirankush Khubalkar and M. T. Sheikh
Page Nos : 423-424
Description :
A thoroughly reinvestigated monocot root has been described from the locality Singhpur, M.P.. India. it has a small-sized, terete root which has been named Velaminorhizos intertrappeanum (Paradkar and Barlingay) Emend. Matin The prominent characters observed in it were— outermost multiseriate epidermis (the velamen), followed by a single-layered exodermis; somewhat differentiated cortex into one-two-layered outer and middle cortex and multi-layered inner cortex with few intercellular spaces and air chambers; endodermis distinct (the innermost layer of cortex), followed by a single-layered pericycle; vascular bundles radial and with exarch xylem, metaxylem vessel elements 9-10 in numbers in a ring, protoxylem present towards endodermis, phloem as traces of faint band in between xylem; presence of conjunctive tissue in between metaxylem elements; conspicuous pith in the centre with few intercellular spaces. Modified diagnosis has been proposed here due to some of the interesting features observed. This root has been assigned to the monocot family Orchidaceae as its extinct genus and named Velaminorhizos, and the species V. intertrappeanum.
Keywords: multiseriate epidermis = velamen, exodermis, radial VBs, monocot orchid
