The Botany of Iceland - 01.12.1942, Síða 48

274
M. P. CHRISTIANSEN
Scapi folia persuperantes, pallidi—brunnescentes, praesertim sub involucro
araneosi.
Involucrum basi truncatum. Squamae exteriores breves, adpressae, 2—3 mm
latae, 8—9 mm longae, lanceolatae, subtus olivaceo-virides, minute albido-marginatae,
+ coloratae, supra glaucescentes. Squamae interiores dilute virides, apice obscuro-
et purpureo-marginatae.
Calathium ignotum.
Achenium dilute cano-stramineum (c. 162), 3.1—-3.3 mm longum, 1.2—1.4 mm
latum, superne latissimum, crebre et minute incurvo-spinulosum, ceterum + spinuloso-
tuberculatum—laeve, in pyramidem late conicam, c. 0.4 mm longam, basi sat
spinulosam sensim vel sat abrupte abiens. Rostrum 8—9 mm longum.
T. ódgittifrons is similar to T. subreduncum and T. declive in the form of the
leaves, but differs from these species by smaller fruits with many upward curved
teeth at the summit; the fruits of the two species mentioned are furnished almost
everywhere with coarse and broad teeth.
Habitat: Home-fields.
Localities: Laugarvatn, 11.VII.1937, fr., phot. S.W.
Geogr. Distr.: Only found in Iceland.
28. Taraxacum scotolepidiforme M.P.Chr. n. sp.
Spec. orig.: Iceland, Reýkjahlíð at Mývatn, 25.VII.1937, leg. M. P. Christian-
sen. Plate II, fig. 28.
Planta gracilis—sat mediocris. Folia sat laete viridia, late lanceolato-lingulata,
sat profunde lobata, petiolis pallidis, nervo mediano pallido—paulo colorato, lobis
iateralibus 2—4 utrinque, sat approximatis, latis, deltoideis, leviter reflexis vel
hamatis, breviter acutis, + dentatis, interdum in apicem contractum, acutum, +
porrectum attenuatis; lobo terminali sat parvo, triangulari-sagittato vel hastato,
o—pauci-dentato.
Scapi folia superantes.
Involucrum basi ovatum. Squamae exteriores 2—3 mm latae, erecto-patentes,
subtus et supra laete virides, + purpureo-marginatae, apice purpurascenti.
Calathium c. 40 mm latum, planum, densum, obscure luteum—croceum, ligulae
marginales subtus stria cano-purpurea notatae.
Antherae polline carentes.
Stigmata lutea—leviter virescentia.
Achenium fusco-stramineum (162—154), 4.0—4.3 mm longum, 1.0—1.2 mm
latum, superne sat dense, + acute spinulosum, ceterum tuberculatum—laeve, in
pyramidem 0.3—0.5 mm longam, sat conicam, interdum spinulosam sensim abiens.
Rostrum 9—10 mm longum.
T. scotolepidiforme seems to be closely related to T. scotoleþis Dahlst. and
T. acidotum M.P.Chr., but differs from these species among other characters by
having no pollen.
Habitat: Home-fields.
Localities: Reykjahlíð at Mývatn, 25.VII.1937, plentiful. N.
Geogr. Distr.: Only found in Iceland.
29. Taraxacum divaricatum M.P.Chr. n. sp.
Spec. orig.: Iceland, Laugar at Breiðamýri, 27.VII.1937, leg. M. P. Christiansen.
Plate II, fig. 29. Plate XV, fig. 131.
Planta 15—35 cm alta. Folia sat obscure—obscure viridia, exteriora + rubescentia,
fere glabra, parce crispa, longa—longissima, anguste lanceolata, regulariter 3—7-