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Table 1 Major microscopic structural events occurring in the developing pods of C. subtropicum after hand pollination

From: Cypripedium subtropicum embryo development and cytokinin requirements for asymbiotic germination

DAP

developmental stage

Integument/seed coat color

30

Megasporogenesis

White

45

Megagametogenesis

White

60

Fertilization

White

75

Proembryo stage

White

90

Early globular embryo stage

Yellowish white

105

Late globular embryo stage

A mixture of white and light brown seeds

120

Near mature seeds with degenerating suspensors

Brown

135

Dry and mature seeds

Brown

150

Capsule ripe and split

Brown

  1. DAP  days after pollination