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Curtis, Lersten, and Nowak 2002 rev. 2015

Cucurbita maceration: sieve tube member with simple sieve plate.

Cucurbita maceration: sieve tube member with lateral sieve areas (SEM).

Grape (Vitis) stem maceration: sieve tube member end with compound sieve plate (SEM).

Grape (Vitis) compound sieve plate (SEM).

Cucurbita sieve tube member with slime plug.

Cucurbita sieve tube member with slime plug.

Cucurbita sieve tube members with slime plugs.

Cucurbita sieve tube members with slime plugs.

Cucurbita sieve plate partially blocked by slime plug.

Cucurbita maxima maceration: face view of sieve plate clogged by slime plug (SEM).