For each collection we dissected corollas, fruits, and/or areoles
to determine the presence of U.
The thin, circular areole
in the micropylar end of the sclerotesta
Boke (1941, 1951, 1952, 1953, 1955, 1956, 1957a, 1957b, 1959, 1961) studied the apical meristem and the development of areoles
and tubercles in various species of tribe Cacteae (e.
The scattered areoles
are formed by 6-14 spines, each 0.
1993), and Yemen (Schultz 1998; Sipman 2002), this species has a thick white thallus, which can cover large areas (extending 10-20 cm or more), and convex areoles
, with big apothecia slightly sunken in the thallus.
In the female from Himmiste and the female from Keskvere, polygonal areoles
are clearly isolated from each other (Fig.
Sterile leaves with veins forming small areoles
within larger areoles
Thallus thin, yellow, lobulate or of small cracked areoles
, or not evident; spores 14 x 7 [micro]m, isthmus 2.
Face rugosoareolate, areoles
becoming smaller towards vertex and paraocular areas, and weaker on supraclypeal area; gena and postgena strongly striate.
Ants forage the nectar secreted over the flowering buttons, from the time they are covered by the areoles
plush hair till they open as pink flowers.
Interestingly, the base of some setae and the areoles
of trichobothria typically fluoresce more brightly than the surrounding surfaces and this property can assist in the location of trichobothria.
FEW of them produce leaves and instead have areoles
, bud-like organs which produce spines.