The Botany of Iceland - 01.12.1942, Blaðsíða 96

322
M. P. CHRISTIANSEN
rhomboideo, lobulis basalibus brevibus, breviter acutis, patentibus. Folia intermedia
et interiora exterioribus similia sed lobis magis robustis, latis, longis, interdum in
apicem sat abruptum, patentem vel porrectum abeuntibus.
Involucrum basi truncatum. Squamae exteriores laxe patentes—recurvatae, 4.0—
2.5 X 10—13 mm, subtus laete—sat obscure olivaceo-virides, pruinosae, supra laete
virides, + purpureo-marginatae, interiores longae, apice fusco-carneo.
Calathium c. 50 mm latum, sat luteum, radians, ligulae marginales subtus stria
cano-purpurea notatae.
Antherae polliniferae.
Stigmata virescentia.
Achenium obscure brunneum, c. 3.4 mm longum, 1.3—1.4 mm latum, superne
latius, robuste, acute erecto- vel patenti-spinulosum, ceterum parce tuberculatum—•
laeve, in pyramidem sat late cylindricam vel sat conicam, 0.8—1.0 mm longam
abiens. Rostrum 12—14 mm longum.
T. rhomboideum has few-lobed outer leaves with a characteristic, almost rhomboid
terminal lobe, and rather bright outer bracts. It seems to be closely related to T.
latihastatum, which has similar leaves, but the latter differs from the former by its
strongly purple-spotted leaves and by its shorter beak (rostrum).
Habitat: Rock-ledges.
Localities: Bleiksárgljúfur, 4.VII.1937, fr., phot. S.
Geogr. Distr. : Only found in Iceland.
93. Taraxacum hypochoeris Dahlst.
H. Dahlstedt: Nordsvenska Taraxaca. Ark. f. bot., Bd. 12, Nr. 2, 1912, p. 40.—
De svenska arterna av slágtet Taraxacum, VIII, Spectabilia, 1930, p. 65.—Exsicc.:
H. Dahlstedt, Taraxaca scandinavica exsiccata, Fasc. V, Nr. 4 (1916).—M.P.Chr.:
Plate VIII, fig. 93.
T. hyþochoeris seems to be closely related to T. rhomboideum and similar species.
It is a typical Macrodonta-species.
Habitat: Rock-ledges.
Localities: Múlakot, 5.VII.1937. S.
Geogr. Distr.: Outside Iceland it occurs in Norway.
Immaculata.
94. Taraxacum latispinulosum M.P.Chr. n. sp.
Spec. orig.: Iceland, Varmahlíð, 20.VII.1937, leg. M. P. Christiansen. Plate VIII,
fig. 94. Plate XXXX, fig. 206.
Planta robusta. Folia laete viridia, parce araneosa, obovato-lanceolata—late lan-
ceolata, integra et grosse hamato-dentata vel lobulata, lobis approximatis, latis,
brevibus, hamatis, acutis, antice ,+ subulato-dentatis, petiolis pallidis, nervo mediano
pallido.
Scapi folia superantes.
Involucrum basi truncatum. Squamae exteriores laxe patentes, 3—6 mm latae,
ovatae, subtus olivaceo-virides, supra laete virides.
Galathium ignotum.
Achenium fusco-stramineum, c. 3.7 mm longum, c. 1.4 mm latum, superne late
et grosse spinulosum, ceterum + spinulosum—laeve, in pyramidem c. 0.9 mm longam,
cylindricam abiens. Rostrum 9-—10 mm longum.
The leaves of T. latispinulosum are broad lanceolate with hamate, acute, closely