Pith

f shc r vab vab

v with ty f

Left Fig. 5. Vessels with tylosis are surrounded by paratracheal parenchyma. A group of fibers contains gelatinous fibers (tension wood). Rhizome of a 70 cm-high hemicryptophyte, ruderal site, Mediterranean, Santa Pau, Catalonia, Spain. Urtica dioica, transverse section.

Right Fig. 6. Groups of thin-walled, un-lignified parenchyma cells located between vascular bundles. Rhizome of a 70 cm-high hemicryptophyte, ruderal site, thermophile zone, Tenerife, Canary Islands. Urtica membranacea, transverse section.

Left Fig. 7. Layers of thin-walled, unlig-1 nified parenchyma cells between vascular ^ bundles. Rhizome of a 70 cm-high hemi', cryptophyte, ruderal site, subalpine zone, Akanthiske, Georgia. Urtica dioica, transverse section.

Right Fig. 8. Rayless xylem. Root collar of a 40 cm-high therophyte, ruderal site, ther-mophile zone, Tenerife, Canary Islands. Pa-rietaria debilis, tangential section.

v with ty f

Left Fig. 9. Large rays (10- to >10-seriate) with sheet cells. Root collar of a 50 cm-high hemicryptophyte, riparian, hill zone, Güss-ing, Burgenland, Austria. Parietaria offici-nalis, tangential section.

Right Fig. 10. Indistinct annual rings in the xylem of a perennial, multi-annual vascular bundle located between paren-chymatic tissues. Rhizome of a 50 cm-high hemicryptophyte, ruderal site, subalpine zone, Gasterntal, Switzerland. Urtica dioica, transverse section.

.starch

If f

Left Fig. 11. Almost homocellular ray consisting of square and upright cells. Only one to two rows of cells are procumbent. Stem of a 1 m-high shrub, Laurus forest, subtropical, Tenerife, Canary Islands. Gesnouinia arborea, radial section.

Right Fig. 12. Irregular groups of vessels between thin-walled large parenchyma cells in the pith. Rhizome of a 70 cm-high hemicryptophyte, ruderal site, coastal zone, Motril, Andalusia, Spain. Urtica urens, transverse section.

Left Fig. 13. Phloem with radial strips of sclerenchymatic cells located between thin-walled, unlignified parenchyma cells. Root collar of a 40 cm-high hemicrypti-phyte, ruderal site, arid zone, Sabah, Libya. Forsskaolea tenacissima, transverse section.

Right Fig. 14. Uniform phloem containing a dilatation. Stem of a 1 m-high shrub, Laurus forest, subtropical, Tenerife, Canary Islands. Gesnouinia arborea, transverse sec-

duct with mu

Left Fig. 15. Phloem with discontinuous layers of sclerenchyma cells. The phellem consists ofrectangular, uniform, radially oriented cork cells. Rhizome of a 50 cm-high hemicryptophyte, ruderal site, thermophile zone, subtropical, Gomera, Canary Islands. Urtica morifolia, transverse section.

Right Fig. 16. Large mucilage plugs in the cortex. The phloem contains groups of small sieve tubes. Root collar of a 40 cm-high therophyte, ruderal site, thermophile zone, Tenerife, Canary Islands. Parietaria - \

debilis, transverse section.

Was this article helpful?

0 0
Building Your Own Greenhouse

Building Your Own Greenhouse

You Might Just End Up Spending More Time In Planning Your Greenhouse Than Your Home Don’t Blame Us If Your Wife Gets Mad. Don't Be A Conventional Greenhouse Dreamer! Come Out Of The Mould, Build Your Own And Let Your Greenhouse Give A Better Yield Than Any Other In Town! Discover How You Can Start Your Own Greenhouse With Healthier Plants… Anytime Of The Year!

Get My Free Ebook


Post a comment