The Botany of Iceland - 01.12.1942, Side 85

THE TARAXACUM-FLORA OF ICELAND
311
3 X 20 mm, subtus stria dilute olivaceo-purpurea notatae, dentibus croceo-pur-
purascentibus.
Antherae praesertim interiores croceo-purpureae, valde poiliniferae.
Stigmata virescentia, subtus sat obscura.
Achenium fusco-stramineum (153), 3.8—4.0 mm longum, c. 1.2 mm latum, sub
apice latius, superne late, acute + erecto-spinulosum, ceterum squamuloso-tuber-
culatum—laeve, in pyramidem cylindricam, 0.7—1.0 mm longam, basi 1-—2-spinulosam
abiens. Rostrum 11—-14 mm longum.
T. asperum has long, many-lobed leaves, patent—slightly upward-curved, often
subulate lobes and long somewhat fusiform fruit with coarse, often + appressed,
spines above. The species seems to be closely related to T. naevosum Dahlst. and was
previously, no doubt, referred to that species. The inner leaves have often + hamate
lobes, and then the species may be mistaken for T. latifrons, which always has +
hamate lobes; but the latter has a small and very dense head and short, broad fruits
with short spines and a long, narrow pyramid.
Habitat: Home-fields.
Localities : Akranes, 12.VII.1937. W.—ísafjörður, 12.VII.1935, fr., phot., Patreks-
fjörður, 11.VII.1935. N.W.—-Skjöldólfsstaðir, 17.VII.1935. E.
Geogr. Distr. : Only found in Iceland.
80. Taraxacum mucroniferum M.P.Chr. n. sp.
Spec. orig. : Iceland, Brekka, 21.VII.1935, leg. M. P. Christiansen. Plate VII,
fig. 80. Plate XXXV, fig. 189.
Planta robusta, 20—40 cm alta. Folia laete cano- vel glauco-viridia, lutescentia,
sat dense araneosa, dilute purpureo-maculata, sat leptalea, lanceolata, parum—sat
profunde lobata, petiolis latis—sat angustis, pallido-roseis—purpureis, lobis 4—6
utrinque, approximatis, e basi latis, deltoideis, patentibus—parce hamatis, subulato-
mucronatis, antice sat sigmoideis—sat convcxis, denticulatis, lobo terminali triangulari,
mucronato, integro—parce denticulato. Folia interiora lobis sat distantibus et sat
angustis.
Involucrum basi truncatum. Squamae exteriores suberectae—sat recurvatae, 4—2
X 12—-14 mm, subtus olivaceo-virides—brunnescentes, + rubro-marginatae, supra
virides, + purpureae, apice + purpureo, interiores 20—25 mm longae, atro-virides,
obtuse corniculatae.
Calathium 40—50 mm latum, leviter radians, obscure luteum. Ligulae marginales
c. 3 mm latae, subtus stria obscure cano-violacea notatae.
Antherae luteae et valde polliniferae, interiores saepe croceo-purpureae et parce
polliniferae.
Stigmata atro-virescentia.
Achenium fusco-stramineum (153—154), c. 3.4 mm longum, c. 1.2 mm latum,
supcrne longe et robuste spinulosum, ceterum laeve— + tuberculatum, in pyramidem
cylindricam, 0.7—0.8 mm longam, basi 1—2-spinulosam abiens. Rostrum 10—11 mm
longum.
T. mucroniferum has lanceolate bright greyish-green, somewhat yellowish leaves,
densely placed, deltoid, finely dentate, acute or mucronate lobes and + purple-
coloured petioles, + dark heads, and especially long inner bracts. It is surely closely
related to T. asperum and its immediate allies.
Habitat: Home-fields, rock-ledges.
Localities: Bleiksárgljúfur, 4.VII.1937, Múlakot, 5.VII.1937, Breiðabólsstaður,
9.VII.1937, fr. S,—Þingvellir, 6.VII.1935. S.W.—Hallormsstaður, 23.VII.1935, phot..
plentiful, Brekka, 21.VII.1935, plentiful. E.
Geogr. Distr. : Only found in Iceland.
21*
L