This hybrid has been found on the island of Mallorca, Tarragona and the Sierra de Cazorla in Jaen, living in the same habitat with their parents. When grown in a brightly lit place with a clear heliofobia, applying their fronds to the stones in an attempt to avoid strong light. Its fronds are up to 20 inches with the blade lanceolate longer than the petiole.
Another copy of this incredible hybrid on the road "Sa Coma Soller Valley. It grows in a patch wall facing north in the shade of an almond tree.
And here's their complex family tree:
Asplenium petrarchae ssp. bivalens Asplenium trichomanes ssp. trichomanes
( PP ) ( TT )
( Apomeiosis ) ( Apomeiosis )
A. petrarchae ssp. petrarchae ----> X <---- A. trichomanes ssp. quadrivalens
( PPPP ) l ( TTTT )
( Hibridación interespecífica )
Asplenium X helii nothosubsp. lainzii .........................
Just so you understand, the case of grandparents autotetraploid is like a human sperm were diploid instead of haploid and carry 46 chromosomes instead of the 23 normal and turn the female egg and carry well beyond the 46 diploid chromosomes the mother. Upon egg fertilization generate a tetraploid with 46 pairs of chromosomes, that is, with 92 chromosomes, all of the father and all of the mother. In human genetics this aberration would not be viable reproductive and egg tetravalent die. In contrast, in the ferns and flowering plants in many of these aberrations are relatively frequent and perfectly feasible, at least in the first generation individuals.
His cousin brother, Asplenium X orellii also allotetraploid, son of Asplenium Asplenium trichomanes majoricum and ssp. quadrivalens, has a phenotype very similar macroscopically, but no hairs or glandular trichomes, while the X Asplenium helii nothosubsp. lainzii is covered with pilosity abundant in the petiole and the proximal third of the blade, inherited from his father Asplenium petrarchae ssp. petrarchae.
However, what more aid to their identification are the trichomes or glandular hairs, more abundant in the proximal third of the blade and petiole and characteristically multicellular, some of them branched. His father Asplenium trichomanes ssp. quadrivalens no glandular hairs and its parent Asplenium petrarchae ssp. petrarchae has an abundant pilosity, but their hairs or trichomes are unicellular, consisting of a single cell and are never branched tubular.
Asplenium X helii nothosubsp. lainzii, like most interspecific allotetraploid hybrid, is sterile, because their sporangia are unable to produce viable spores at the time of meiosis. The two genomes that coexist in the nucleus of their cells are so different, so incompatible, that can not be matched to generate haploid spores with a genetic endowment compatible with life and die before maturity, being reduced to very sticky black masses broken .