The Botany of Iceland - 01.12.1942, Side 90

316
M. P. CHRISTIANSEN
utrinque, approximatis, deltoideis, fol. interiorum vel summorum hamatis, obtusis—-
breviter acutis—acutis, patulis vel leviter reflexis, superioribus grosse 1—2-dentatis,
interioribus denticulatis, lobo terminali parvo, triangulari, obtuso—mucronato, den-
ticulato—dentato.
Involucrum 10 X 19 mm, subobscure viride, apice atfo-viridi.
Squamae exteriores 4—2 X 11—13 mm, suberectae—sat recurvatae, subtus
obscure olivaceo-virides, pruinosae, apice purpureo, ecorniculatae, supra laete
virides.
Calathium 50—60 mm latum, valde radians, obscure luteum. Ligulae marginales
c. 3 X 20 mm, subtus stria purpurea notatae, dentibus purpureis.
Antherae polliniferae—parce polliniferae.
Stigmata olivaceo-virescentia.
Achenium fusco-stramineum (153), c. 3.7 mm longum, c. 1.2 mm latum, superne
latius, dense et grosse suberecto-spinulosum, ceterum dense squamuloso-tuberculatum,
in pyramidem 0.7-—0.9 mm longam, cylindricam, 1-—2-spinulosam abiens. Rostrum
8—10 mm longum.
T. selenophoreum has lanceolate, dark yellowish-green leaves, densely placed,
hamate and coarsely dentate or deltoid and finely dentate lobes; dark olive-green,
loosely patent outer bracts, and large, dark-yellows heads. Purple spots are absent,
but as it resembles the species of the group Naevosa in many characters, provisionally
placed in that group.—It seems to be nearly allied to T. triste. See the latter.
Habitat: Home-fields, rock-ledges, birch-copses.
Localities: Stóriendi in Þórsmörk, 8.VII.1937. S.—Bílðudalur, 11.VII.1935. N.W.
—Egilsstaðir, 18.VII.1935, in quantity, fr., phot., Brekka, 21.VII. 1935. E.
Geogr. Distr.: Only found in Iceland.
87. Taraxacum triste M.P.Chr. n. sp.
Spec. orig.: Iceland, Reykjavík, 6.VII.1935, leg. M. P. Christiansen. Plate VII,
fig. 87. Plate XXXVII, fig. 197.
Planta parva—mediocris, 15—25 cm alta. Folia obscure cano-viridia—atro-viridia,
dense araneosa, lingulato-lanceolata—anguste lanceolata, sat profunde lobata, petiolis
angustis, subtus pallidis, supra brunnescentibus vel obscure brunneo-violaceis, nervo
mediano + brunneo-purpureo, lobis 4—7 utrinque, approximatis—sat distantibus,
latis, deltoideis, interdum superioribus angustis, longis, hamatis, acutis—acuminatis,
patentibus vel + reflexis, antice dense sed irregulariter subulato-dentatis, interdum
laciniatis, lobo terminali parvo, triangulari—sagittato vel hastato, in apicem +
protracto, obtuso—acutiusculo.
Scapi pallidi—- + colorati, sat dense araneosi.
Involucrum sat turbinatum, obscure viride.
Squamae exteriores angustae, laxe arcuatae, 2.5—2.0 X c. 10 mm, subtus obscure
olivaceo-virides et purpureae, supra saepe valde purpureae, interiores obscure virides,
apice purpureo.
Calathium c. 45 mm latum, planum, valde radians, obscure luteum—croceum,
ligulae interiores angustae, sat canaliculatae, dentibus purpureis, marginales 2.3 X
18 mm, leviter canaliculatae, subtus stria cano-violacea—purpurea notatae, dentibus
purpureis.
Antherae valde polliniferae.
Stylus virescens. Stigmata virescentia—atro-virescentia.
Achenium sat fusco-stramineum (162—154), c. 4 mm longum, 1.3—1.5 mm
latum, superne crebre et robuste suberecto-spinulosum, ceterum squamuloso—tubercu-
latum, sed raro laeve, in pyramidem 0.6—0.8 mm longam, cylindricam, saepe spinu-
losam abiens. Rostrum 10—11 mm longum.