Hypnum cupressiforme – holtafaxi

Skrifað um March 10, 2013 · in Mosar · 557 Comments

Hypnum cupressiforme er jafnan auðþekktur. Ljósm. ÁHB.

Hypnum cupressiforme er jafnan auðþekktur. Ljósm. ÁHB.

Hypnum cupressiforme Hedw. (holtafaxi) er mjög algengur mosi um allan heim, nema á Suðurskautslandi, einkum þó í Evrópu, Asíu og Norður-Ameríku. Þetta er ein fyrsta tegundin, sem flestir byrjendur í mosafræðum læra að þekkja úti í náttúrunni, þó að breytileikinn sé mikill.

Plöntur eru meðalstórar, 2-10 cm á lengd (sjaldan lengri), oftast jarðlægar, glansa, grænar eða ljósgrænar til nokkuð brúnleitar eða gulbrúnar, einkum eldri hlutar plöntu (stöngull); óreglulega greinóttar.

Neðan á stöngli og greinum eru oft rauðbrúnir rætlingar, sléttir. Yfirþekja í stöngli úr litlum, þykkveggja frumum; miðstrengur illa þroskaður.

Blöð standa út í tvær áttir og sveigjast niður að jörð, egglensu- eða lensulaga, 1,5-2,2 x 0,5-0,8 mm að stærð; mjókka fram í mjóan odd; jafnan heilrend nema stöku sinnum tennt fremst; blaðrönd flöt nema neðst er hún lítið eitt útundin. Rif stutt og klofið eða ekkert. Örblöð þráð- eða lensulaga, 1-3 frumur við grunn, fá, nærri hliðargreinum.

Blöð á Hypnum cupressiforme eru talsvert breytileg. Teikn. ÁHB.

Blöð á Hypnum cupressiforme eru talsvert breytileg. Teikn. ÁHB.


Frumur 50-80 x 4-6 μm; grunnfrumur styttri og breiðari og með þykkari veggi; hornfrumur mynda þríhyrnt til ferhyrnt svæði með ferningslaga, óreglulegar frumur; smáar og grænar í efri hluta horna; á stundum eru frumur neðst í hornum gulbrúnar eða glærar.

Plöntur eru einkynja og sjaldan með gróhirzlur. Stilkur er rauðbrúnn, 1-2,5 cm á lengd. Gróhirzla rauðbrún, 1,8-2,8 cm löng, sívöl og bogin. Lok með beinni trjónu og keilulaga. Gró 18-20 μm að þvermáli, fín-vörtótt.

Vex í hálfgrónu landi, á steinum, klöppum, melum, holtum, hraunum og víðar. Er algengur hér á landi á láglendi, nema hefur aldrei fundizt frá Stöðvarfirði norður og vestur að Eyjafirði.

Hypnum cupressiforme vex við nær allar aðstæður nema í votlendi, einkum þó á steinum og í klettum. Ljósm. ÁHB.

Hypnum cupressiforme vex við nær allar aðstæður nema í votlendi, einkum þó á steinum og í klettum. Ljósm. ÁHB.

 

Tegundin er mjög breytileg og mörgum afbrigðum hefur verið lýst.

Samnefni: Hypnum pseudo-fastigiatum J. K. A. Müller, Stereodon cupressiformis (Hedwig) Mitten

Aðvörun:
Á þessum stað: http://floraislands.is/mosar.html stendur skírum stöfum orðrétt:
»Eini íslendingurinn sem lagt hefur stund á mosaflóru Íslands af nokkurri alvöru, er Bergþór Jóhannsson.«

Menn eru því beðnir um að trúa því mátulega, sem greint er frá á vefslóð þessari.

Rétt er að geta þess, að nú hefur þessum texta verið breytt (20./3.).

ÁHB / 10.3. 2013

 

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