Yes sir, Orchids are lithophytes too, I missed it, but I include them into epiphytes. I will write abt micorrhiza soon... Thanks so much for the suggestions. Keep more coming :) Pankaj
On Thu, Oct 3, 2013 at 5:55 PM, D.S Rawat <drdsrawat.alpin...@gmail.com> wrote: > Pankaj Ji through some light on Orchididaceous mycorrhiza; it will be > interesting. > DSRawat Pantnagar > > > On Thursday, October 3, 2013 11:00:32 AM UTC+5:30, Dr Pankaj Kumar wrote: >> >> Orchids are very unique and they are found in wide range of habitats >> at diverse elevations. >> Still they are highly sensitive. They can be EPIPHYTIC (growing on >> other trees- not as parasite); TERRESTRIAL (growing on ground); >> AQUATIC (growing in water); SEMI-AQUATIC (growing near water or in >> areas which are waterlogged for significant duration of the year); >> SUB-TERRENEAN (growing completely below ground). >> >> They occupy great range of elevations depending on the region of earth >> they are found. >> People say that epiphytic orchids are not found at higher elevations. >> But this is not true. Some taxa like Dendrobium brevicaule are found >> upto 4000m elevation. Overall, terrestrial orchids reach much higher >> elevation that epiphytic ones. >> >> Orchids occupy wide range of habitats. However the diversity is lower >> in homogenous vegetation where as it is higher in heterogenous >> forests. Highest diversity is found in warm and humid areas like >> tropical rain forests. >> >> One of the main reasons for their high diversity and wide distribution >> is the absence of endosperm in the seeds. Hence they are very light >> and can be carried to greater distance by wind. When they fall in new >> area, they either adapt well or they die. In rare cases they try to >> customize themselves to the new environment giving rise to a new >> species over a long period of time. Orchids are cross pollinated and >> natural hybrids are known to occur in wild. Cross pollination helps in >> maintaining high genetic diversity within and between different >> populations. >> >> Regards >> Pankaj >> >> -- >> *********************************************************** >> Pankaj Kumar, Ph.D. >> IUCN-SSC Orchid Specialist Group Asia >> >> Office: >> Conservation Officer >> Orchid Conservation Section >> Flora Conservation Department >> Kadoorie Farm and Botanic Garden (KFBG) Corporation >> Lam Kam Road, Tai Po, New Territories, Hong Kong. >> Residence: >> 151, 1st Floor, Tai Om Tsuen >> Lam Tsuen, Tai Po, New Territories, Hong Kong. >> >> email: pku...@kfbg.org; sahani...@gmail.com >> Phone: +852 2483 7128 (office - 8:30am to 5:00pm); +852 9436 6251 >> (mobile). Fax: +852 2483 7194 > > -- > You received this message because you are subscribed to the Google Groups > "efloraofindia" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to indiantreepix+unsubscr...@googlegroups.com. > To post to this group, send email to indiantreepix@googlegroups.com. > Visit this group at http://groups.google.com/group/indiantreepix. > For more options, visit https://groups.google.com/groups/opt_out. -- *********************************************************** Pankaj Kumar, Ph.D. IUCN-SSC Orchid Specialist Group Asia Office: Conservation Officer Orchid Conservation Section Flora Conservation Department Kadoorie Farm and Botanic Garden (KFBG) Corporation Lam Kam Road, Tai Po, New Territories, Hong Kong. Residence: 151, 1st Floor, Tai Om Tsuen Lam Tsuen, Tai Po, New Territories, Hong Kong. email: pku...@kfbg.org; sahanipan...@gmail.com Phone: +852 2483 7128 (office - 8:30am to 5:00pm); +852 9436 6251 (mobile). Fax: +852 2483 7194 -- You received this message because you are subscribed to the Google Groups "efloraofindia" group. To unsubscribe from this group and stop receiving emails from it, send an email to indiantreepix+unsubscr...@googlegroups.com. To post to this group, send email to indiantreepix@googlegroups.com. Visit this group at http://groups.google.com/group/indiantreepix. For more options, visit https://groups.google.com/groups/opt_out.
