Markaan ka hadlayno asalka dhirta, magac ayaa had iyo jeer soo baxa: Cooksonia. Waa warshad soo baxday bartamihii xilligii Siluria, taas oo ah, inta u dhexeysa 428 iyo 423 milyan oo sano ka hor.
Halkaas ayaa dhir badan oo aan maanta naqaano laga horumarin karo, laga bilaabo geedaha waaweyn ilaa iyo ubaxyada. Laakiin, Sida ay ahayd?
Astaamaha Cooksonia
Halyeeygeena wuxuu ahaa geed ku noolaa ficil ahaan dhammaan gobollada adduunka: Ireland, Wales, England, Bolivia, Mareykanka, Great Britain, Australia. Dhererkiisuna wuxuu ahaa in ka badan 10 sentimitir, laakiin waa wax aad u xiiso badan in la ogaado maadaama ay ahayd mid ka mid ah dhirta ugu horreeya ee dhulka ku nool.
Ma lahayn caleemo, laakiin jiridiisa, oo qaabeeya Y, waxay awood u lahaayeen inay soo saaraan chlorophyll, sidaa darteedna, sawir-gacmeed iyo koritaan. Sidoo kale xidido kuma lahayn sidaan maanta ku naqaano, laakiin waxay ku xirnayd dhulka iyadoo loo marayo rhizome jiif ah. Qaabkeeda isku dhufashada wuxuu ku dhex maray nabarradii lagu sameeyay dhammaadka jir kasta, sporangia, in kasta oo aysan weli caddeyn sida.
Noocyada
Ilaa hadda, toddobo nooc oo kala duwan ayaa la helay:
- C.pertoni, sanadkii 1937
- C. hemisphaerica, sanadkii 1937
- C. cammbrensis, sanadkii 1979
- C.paranensis, sanadkii 2001
- C. bohemia, 1980kii
- C. baankii, sanadkii 2002
In kasta oo aan loo tixgelin fosil tilmaame, haddana waa wuxuu ahaa shahaado horumarineed oo hiddo-wadaage asaasi ah. Xaqiiqdii, afar nooc oo noocyo kala duwan oo isboorti ah oo ka kooban noocyo kala duwan ayaa laga helay is-burburin ka mid ah noocyada Cooksonia.
Dhirtaas waxaa sharraxay William William Lang oo u dhashay dalka Ingiriiska 1937, oo u bixiyey magacooda si loogu sharfo Isabel Cookson, oo ah haweeney ku uruurisay muunad mid ka mid ah noocyada saddex sano ka hor Perton Quarry.
Maxaad u maleysay geedkan bakhtiyey?