Willdenowia 36
Willdenowia – Annals of the Botanic Garden and
Botanical Museum Berlin-Dahlem
ISSN 0511-9618
© 2006 BGBM Berlin-Dahlem.
Ancev, M. & Goranova, V.: Trichome morphology of eleven genera of
the tribe Alysseae (Brassicaceae) occurring in Bulgaria
Willdenowia 36 (Special Issue): 193-204.
doi:10.3372/wi.36.36116
Abstract
The leaf and silicule trichomes of 18 species of Alysseae
were studied by scanning electron and light microscopy. Four
trichome types are distinguished: (1) simple, (2) stalked 2– to
5-armed, (3) stellate and (4) dendritic trichomes. (1) Simple
trichomes cover the leaves of Lunaria rediviva and, mixed
with stalked 2– to 3-armed ones, compose the leaf indumentum of Camelina
sativa. The simple trichomes on the silicules of Clypeola
jonthlaspi subsp. microcarpa are columnar with
transverse furrows. (2) Stalked 2-5-armed trichomes are present on
the leaves of Draba korabensis, D. muralis, D. siliquosa and
Erophila verna subsp. spathulata. Peculiar stalked
trichomes with swollen globular base occur on the lower leaf surface
of D. muralis. (3) Stellate trichomes cover the leaves of
Alyssoides utriculata subsp. bulgarica, Aurinia
saxatilis subsp. orientalis, A. uechtritziana and Clypeola
jonthlaspi and the leaves and silicules of Alyssum
cuneifolium s. str., A. orbelicum, A. pirinicum and Fibigia
clypeata. (4) Dendritic trichomes co-occur with stellate ones on
the silicules (but rarely on the leaves) of Berteroa species and
Fibigia clypeata. The trichomes may be smooth (some stellate
trichomes), minutely warty (simple and dendritic trichomes) or
tuberculate (most of the stellate trichomes). The trichomes of the
morphologically related species Alyssum pirinicum, a new
combination validated here, and A. cuneifolium provide
additional reliable features to distinguish them.
Key words:
angiosperms, Cruciferae, indumentum, micromorphology, scanning electron microscopy.
