The Botany of Iceland - 01.12.1942, Side 72

298
M. P. CHRISTIANSEN
The fruit of T. dilutiroseum is very like that of T. sþectabile Dahlst., but the
species differs from the latter by having rough leaves with fewer lobes and slightly
coloured stripes on the marginal ligulae. In addition the species seems to vary a
good deal as to the intensity of colour in the stripe. It seems to be closely related
to T. subspectabile M.P.Chr.; this species, however, has always very fine spines on
the fruit and not like T. dilutiroseum few and long spines at the summit.
Habitat: Home-fields, grassy mountain-slopes, birch-copses, rocks.
Localities: Múlakot, 6.VII.1937, plentiful, fr., phot. S.—Þrastarlundur, 11.VII.
1937, Hveragerði, 2.VII.1937, Þingvellir !, 30.VI.1937. S.W.—Akranes, 13.VII.1937.
W.—Siglufjörður, 11.VII.1937. N.
Geogr. Distr.: Found, outside Iceland, on the Faeroes (Thorshavn, 25.VI.1937)
and in Sweden (Harjedalen, Hamravallen, 7.VIII.1907 (H. Dahlstedt).
63. Taraxacum calanthum Dahlst. ?
H. Dahlstedt: De svenska arterna av slágtet Taraxacum, VIII, Spectabilia, p. 13.
—M.P.Chr.: Plate V, fig. 63.
Not having seen the fruit of T. calanthum, found in Norway, I cannot say with
certainty, whether the plant I found in Iceland actually belongs to this species. If it
should turn out later on that T. calanthum has another shape of fruit than the
Icelandic form, the latter will be described under the name T. callineuron M.P.Chr.
Habitat: Birch-copses.
Localities: Stóriendi in Þórsmörk, 8.VII.1937, fr. S.
Geogr. Distr.: Found, outside Iceland, only in Norway.
64. Taraxacum angustifrons M.P.Chr. n. sp.
Spec. orig.: The Faeroes, Thorshavn, 25.VI.1937, leg. M. P. Christiansen. Plate
VI, fig. 64. Plate XXVII, fig. 166.
Planta mediocris, sat gracilis. Folia longa, leptalea, anguste lanceolata, integra
vel sat profunde lobata, laete cano-viridia, petiolis longis, angustis, pallidis vel paulo
coloratis, nervo mediano + purpureo, lobis 3—5 utrinque, brevibus, deltoideis,
patentibus, superioribus interdum hamatis, acutis, lobo terminali triangulari—hastato,
acuto.
Involucrum basi sat truncatum. Squamae exteriores numerosae, adpressae.
Calathium ignotum.
Achenium c. 4.6 mm longum, c. 1.4 mm latum, fusco-stramineum, superne longe
et acute spinulosum, ceterum laeve, in pyramidem c. 1 mm longam, cylindricam—
subconicam abiens. Rostrum c. 9 mm longum.
The leaves of T. angustifrons are long, narrow, somewhat bright green with a
long, narrow petiole; the fruits are large with long, coarse, pointed spines at the
top and with long, almost cylindrical pyramid ; with regard to the fruits the species
seems to be related to T. furvum and its allied; these species, however, have not
the long, narrow leaves.
Near Laugar at Breiðamýri I found a solitary specimen of a Taraxacum-species
with very large and strong fruits with coarse, pointed spines at the summit and
a long, broad pyramid. The specimen probably belongs to the above described T.
angustifrons, found near Thorshavn on the Faeroes.
Habitat: Home-fields.
Localities: Laugar at Breiðamýri, 27.VII.1937. (?) N.
Geogr. Distr.: Found, outside Iceland, on the Faeroes.