Bryophyta-9

Stem Anatomy
is complex compared to the previous taxa we have examined. The Epidermis forms multicellular Rhizoids which provide Anchorage & Absorption

There is a Cortex just inside the Epidermis of Stems & "Rhizomes". It contains Thick-Walled cells which provide Storage & Support.

There is a Central Strand which contains Vascular Tissues. These are called Leptoids (Phloem) & Hydroids
("Xylem").

Support Cells called Sterids are also present. These are like Sclerenchyma Fibers found in seed plants.

Polytrichum Stem X-S

Central Strand from Polytrichum
Note the Vascular Tissues & the Leaf Traces in the Cortex.

Stereids & Hydroids in the Central Strand

Note the small diameter of the Sterids & their relatively thick walls.