The Botany of Iceland - 01.12.1942, Síða 54

280
M. P. CHRISTIANSEN
antice --- dentatis, lobo terminali parvo, triangulari-sagittato vel hastato, acuto,
integro—parce dentato, lobulis basalibus acutis, marginibus rectis—concavis.
Involucrum basi ovatum. Squamae exteriores 2—3 X 10—12 mm, erecto-patentes,
subtus laete olivaceo-virides, + purpureo-marginatae, supra laete virides, apice pur-
purascenti.
Calathium c. 55 mm latum, obscure luteum, convexum, densum—leviter radians,
ligulae marginales c. 3 X 16 mm, subtus stria cano-rosea notatae, dentibus pur-
purascentibus.
Antherae valde polliniferae.
Stigmata virescentia.
Achenium fusco stramineum (162—154), 3.8—4.0 mm longum, superne sat
dense, + acute spinulosum, ceterum tuberculatum—laeve, in pyramidem 0.4—0.7
mm longam, sat conicam, interdum inferne bi-spinulosam sensim abiens. Rostrum
7—9 mm longum.
T. acidotum is recognisable by its lanceolate, regular leaves with subulate lobes.
It seems to be closely related to T. scotolepis Dahlst., but differs from this species
among other characters by the fruits. According to the original-description of T.
scotolepis it should have slightly warty fruits. I have seen specimens with such fruits
in the Riksmuseum in Stockholm. But in addition other specimens may be seen
there—also named T. scotolepis—with fruits of the T. acidotum-type, and since
these herbs are similar to the Icelandic ones as to the shape of the leaves etc., they
must be classed with T. acidotum.
Habitat: Home-fields.
Localities: Flatey in Breiðifjörður, 10.VII.1935. W.—Siglufjörður, 14.VII.1935,
fr., phot., Víðimýri, 20.VII.1935, plentiful, phot., Akureyri, l.VIII.1935. N.
Geogr. Distr.: Outside Iceland, recorded from Sweden (Jámtland, Ann, 4.VII.
1911 (Sundberg), Áre, l.VII.1914 (Dahlstedt), Oviken, 9.VII.1935).
Ciconia.
38. Taraxacum longihastatum M.P.Chr. n. sp.
Spec. orig.: Iceland, Þingvellir, 7.VII.1935, leg. M. P. Christiansen. Plate III,
fig. 38. Plate XIX, fig. 142 and 143.
Planta 25—40 cm alta. Folia obscure viridia, anguste lingulato-lanceolata vel
lorata, parum profunde 2—3-loba, petiolis sat angustis, pallidis— + purpureis, nervo
mediano + purpureo, lobis sat distantibus, basin versus latis vel gradatim in inter-
lobia transeuntibus, in apicem patentem vel leviter reflexum, acutum sensim at-
tenuatis, integris—parce dentatis, lobo terminali longissimo, lingulato basi hastato,
acuto, integro. Folia interiora integra, robuste dentata.
Involucrum obscure viride, sat turbinatum. Squamae exteriores 3—2 X 12—13
mm, lineares, laxe patentes, subtus obscure olivaceo-virides, + pruinosae, angustis-
sime albido-marginatae, supra laete virides.
Calathium 50—60 mm latum, convexum, radians, perobscure luteum, ligulae
marginales subtus obscure purpurea notatae.
Antherae polliniferae.
Achenium perlongum, 4.6—4.8 mm longum, 1.1—1.2 mm latum, superne parce,
minute sed acute spinulosum, ceterum laeve, in pyramidem c. 0.4 mm longam,
conicam sensim abiens. Rostrum 10 mm longum.
T. longihastatum is recognisable by its long, narrow, almost strap-like leaves,
dark heads and very long and narrow fruits, which are finely toothed at the summit
only. The species seems to be closely related to T. sagittifolium Lindb. fil., the fruits