Exostome teeth

Exostome teeth present state 1 absent state 2. 

Exostome teeth 70 pm wide at least state 1 70 pm wide at most state 2. 

Exostome teeth partly or entirely bordered above the base state 1 not bordered or slightly bordered state 2. 

Ornamentation of the dorsal plates in the basal third of the exostome teeth conspicuously striate (striae set with papillae or not) state 1 smooth, papillose, or weakly striate near the tooth base state 2. 

Trabeculae in the middle parts of the exostome teeth shot to strongly protruding and closely set state 1 very short to short and distant state 2. 

Exostomes well developed (0) or reduced (1). The length of the exostome teeth was used to estimate the degree of exostome reduction. Taxa with exostome teeth up to 350 J,m long were coded as rednced. 

Endostome processes, when present, alternating with the teeth of the exostome. 

Endostome processes opposite the teeth of the exostome, either free or united with them, but the peristome sometimes entirely wanting hypophysis sometimes highly developed acrocarpous mosses.Order Splachnales (Funariales)... 

The exostome is formed from the common periclinal cell wall pair between the inner wall of the OPL and the outer wall of the PPL. The endostome is formed from the common periclinal cell wall pair between the inner wall of the PPL and the outer wall of the IPL (Figure 12.1). Autolysis of the anticlinal walls of the cells between the exostome and the endostome separates the two rings of the diplolepidous peristome, while autolysis of the periclinal walls between adjacent teeth separates the structures within each ring of the peristome. In reduced peristomes this autolysis may be incomplete, leaving adjacent structures partially attached. 

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