Microbryum starckeanum var. brachyodus 2. Peristome absent or rudimentary, leaves very shortly mucronate 1c. Microbryum starckeanum var. Stem leaves mucronate to short-awned. Capsule stegocarpous, peristome present, usually well-developed but truncate apically.
Spores smooth or tuberculate.
Capsule contents not differentiating into spores is not uncommon in variants of M. starckeanum indicating the possibility of occasional hybridization. Anacalypta starckeana var. Stem leaves very shortly mucronate. Capsule stegocarpous, peristome absent or rudimentary. Spores smooth or tuberculate.