Table 1 Description of developmental stages during orchid seeds germination, according [23] with some alterations concerning stage 2 (marked*)

Stage 1

Unimbibed seed with intact testa

Stage 2*

Swelling of embryo and its enlargement followed by splitting of testa

Stage 3¹

Protocorm arising, when rupture of testa occurred and first rhizoids developed

Stage 4¹

Enlargement of protocorm and formation of protomeristem

Stage 5^1,2

Further enlargement and development of first green leaf

Stage 6^1,2

Emission of second green leaf