Helium.com | View Amanda Dcosta's articles http://www.helium.com/users/491999.xml View Amanda Dcosta's articles en-us Copyright Helium.com Tue, 07 Feb 2012 14:00:51 GMT Tue, 07 Feb 2012 14:00:51 GMT Psilotum is a genus that has only two species.  They are Psilotum nudum and Psilotum flaccidum. The word Psilotum is derived from the Greek w... http://www.helium.com/items/2289193-general-description-of-psilotum-species Tue, 07 Feb 2012 14:00:51 The vascular tissue in plants are a major, continuous and unified system in a plant right from the root tip to the upper-most leaf.  It's imp... http://www.helium.com/items/2288874-importance-of-vascular-tissue-in-plants Mon, 06 Feb 2012 20:41:04