He then undertook a Master's degree under the supervision of Brian Grieve, focussed on soil-plant relationships of " Hakea ", especially its proteoid roots.
12.
Proteoid roots are now known to occur in 27 different Proteaceae genera, plus around 30 species from other families, including Betulaceae, Casuarinaceae, Eleagnaceae, Leguminosae, Moraceae and Myricaceae.
13.
Like most other Proteaceae, " B . spinulosa " has proteoid roots, roots with dense clusters of short lateral rootlets that form a mat in the soil just below the leaf litter.
14.
Like most other Proteaceae, " B . epica " has proteoid roots, roots with dense clusters of short lateral rootlets that form a mat in the soil just below the leaf litter.
15.
On the extremely ancient soils of Australia and Southern Africa, proteoid roots with their extremely dense networks of root hairs can absorb so much rainwater as to prevent runoff even when substantial amounts of rain fall.
16.
Most Proteaceae and all " Banksia " species, including " B . aemula ", have proteoid roots, roots with dense clusters of short lateral rootlets that form a mat in the soil just below the leaf litter.
17.
"Banksia grossa " is one of five closely related " Banksia " species that have highly unusual flower nectar . { { efn | The other four species are " Banksia sphaerocarpa ", " proteoid root mat.
18.
In 1960, Helen Purnell examined 44 species from ten Proteaceae genera, finding proteoid roots in every genus except " Persoonia "; she then coined the name " proteoid roots " in reference to the plant family in which it was known to occur.
19.
In 1960, Helen Purnell examined 44 species from ten Proteaceae genera, finding proteoid roots in every genus except " Persoonia "; she then coined the name " proteoid roots " in reference to the plant family in which it was known to occur.
20.
Consequently, available nutrient levels in Australian and Southern African soils tend to be orders of magnitude lower than those of similar climates in other continents, and native flora compensate for this through much higher rooting densities ( e . g . proteoid roots ) to absorb minimal phosphorus and other nutrients.
