The Botany of Iceland - 01.12.1942, Page 112
338
M. P. CHRISTIANSEN
Habitat: Home-fields, gardens.
Localities: Reykjavík, 6.VII.1935, fr. S.W.
Geogr. Distr. : Outside Iceland it occurs in Norway, Sweden, Denmark, Germany,
Lettland, Esthonia, Russia, Finland, France.
114. Taraxacum duplidens Lindb. fil.
H. Lindberg: Taraxacum-former frán södra och mellersta Finland. Acta soc.
pro fauna et flora fennica, 29, Nr. 9, 1907, p. 38.—Exsicc.: H. Dahlstedt: Taraxaca
scandinavica exsiccata. Fasc. I, Nr. 49.—M.P.Chr.: Plate X, fig. 114 .
No doubt introduced.
Habitat: Gardens, home-fields.
Localities: Akranes, 13.VII.1937, plentiful, fr. W.
Geogr. Distr.: Outside Iceland it occurs in Norway, Sweden, Denmark, Germany,
Lettland, Esthonia, Finland, Russia.
115. Taraxacum angustisquameum Dahlst.
H. Dahlstedt in H. Lindberg: Taraxacum-former frán södra och mellersta Fin-
land. Acta soc. pro fauna et flora fennica, 29, Nr. 9, 1908, p. 23.—Exsicc.: H. Dahl-
stedt: Taraxaca scandinavica exsiccata, Fasc. 5, Nr. 34 and 35.—M.P.Chr.: Plate X,
fig. 115.
No doubt introduced.
Habitat: Home-fields, gardens.
Localities: Reykjavík, 8.VII.1935, fr., 29.VI.1937. S.W.—Akranes, 13.VII.1937,
plentiful. W.
Geogr. Distr. : Outside Iceland it occurs in Norway, Sweden, Denmark, Germany,
Lettland, Esthonia, Finland, Russia.
116. Taraxacum myvatnense M.P.Chr. n. sp.
Spec. orig.: Iceland, Reykjahlíð at Mývatn, 25.VII.1937, leg. M. P. Christian-
sen. Plate X, fig. 116. Plate XXXXIV, fig. 218.
Planta mediocris, 20—30 cm alta. Folia perobscure viridia, sat dense araneosa,
exteriora et intermedia lanceolata, profunde lobata, petiolis angustis et nervo
mediano -T purpureis, lobis 5—7 utrinque, approximatis, deltoideis, sensim in apicem
longum, acuminatum, reflexum attenuatis, antice rectis—paulo concavis, valde
subulato-dentatis, interlobiis brevibus, sat latis, subulato-dentatis, lobo terminah
parvo, triangulari—sagittato-hastato, acuto vel supra medium contracto et + pro-
tracto, o—pauce dentato, lobulis basalibus acutissimis. Folia interiora aut late lingulato-
lanceolata integra, margine grosse dentata vel 3—4-loba, dentata, lobo terminali
magno, ovato-sagittato, mucronato vel in apicem protracto, irregulariter subulato-
dentato.
Involucrum laete viride. Squamae exteriores breves, 2—3 mm latae, arcuatae,
subtus laete olivaceo-virides, supra glaucescentes.
Calathium parvum, 30—40 mm latum, densum, convexulum, laete luteum.
Ligulae marginales c. 2.5 mm latae, subtus stria cano-violacea notatae.
Antherae parce polliniferae.
Stigmata canescentia—subtus sat obscura.
Achenium fusco-brunneum, 2.1—2.3 mm longum, 0.8—1.0 mm latum, supeme
spinulis densis, longis, tenuibus, patulo-incurvis instructum, ceterum + spinuloso-
tuberculatum—laeve, in pyramidem subcylindricam, 0.7—0.8 mm longam, 1—2-
spinulosam abiens. Rostrum c. 8 mm longum.