pycniumn.

Brit.

/ˈpɪknɪəm/, U.S.

/ˈpɪkniəm/

Inflections: Plural pycnia.

Origin: A borrowing from Greek, combined with an English element. Etymons: Greek πυκνός , pycnidium n.

Etymology: < ancient Greek πυκνός thick, dense (see pycno- comb. form) + -ium (in e.g. pycnidium n.).

Mycology.

In rust fungi: a flask-shaped fruiting body producing haploid spores and receptive hyphae, which after fertilization results in the formation of an aecium; a spermogonium.

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the world > plants > particular plants > fungi > [noun] > parts of > reproductive parts

capsule1693

perithecium1800

aecidium1821

hymenium1830

pseudoperidium1832

pseudoperithecium1832

disc1842

trichidium1842

spicule1843

sporophore1849

stylospore1851

pycnide1856

cyst1857

pycnidium1857

basidium1858

cystidium1858

basidiospore1859

conidium1861

pollinarium1861

gonosphere1865

hymenophorum1866

spicula1866

teleutospore1866

promycelium1867

gonosphaerium1873

hymenophore1874

paracyst1874

sterigma1874

pollinodium1875

scolecite1875

uredospore1875

metuloid1879

operculum1879

uredo1879

aecidiospore1880

pycnidiospore1880

uredo-fruit1882

chlamydospore1884

teleutosorus1884

fruitcake1885

ascocarp1887

periplasm1887

pycnospore1887

pyrenocarp1887

macrostylospore1894

autobasidium1895

oidium1895

zygophore1904

aeciospore1905

aecium1905

pycniospore1905

teliospore1905

telium1905

uredinium1905

uredosorus1905

fruit-body1912

sporodochium1913

probasidium1916

fruiting body1918

pycnium1926

holobasidium1928

protoperithecium1937

uredium1937

1905 J. C. Arthur in Bot. Gaz. 39 221 For the sorus of the initial stage [of uredineal fungi], usually..called spermogonium, pycnidium, etc., I propose pycnium..; derivatives pycnial, pycniospores, etc.

1926 Mycologia 18 90 The inefficient sori (pycnia) are present or absent in both macrocyclic and microcyclic rusts.

1970 J. Webster Introd. Fungi 376 Some rusts have only telia, with or without pycnia, and are said to be microcyclic.

1996 Canad. Jrnl. Bot. 74 461 The results are consistent with the fungus having a haploid infective mycelium that produces functional pycnia.

Derivatives

ˈpycnial adj. of, relating to, or of the nature of a pycnium; resulting from pycnia.

ΘΚΠ

the world > plants > particular plants > fungi > [adjective] > of, bearing, or characterized by parts

umbonated1752

operculate1775

veiled1776

adnexed1821

pileate1828

sorediferous1829

umbonate1829

floccose1830

adglutinate1831

angiosporous1847

stylosporous1851

byssoid1857

mycelioid1857

sclerotioid1857

soredioid1857

pileiform1858

basidiosporous1859

pileated1859

sorediform1859

tigellular1860

tetradymous1866

tigellate1866

mycelial1867

xylostromatoid1871

hymenial1874

hyphal1875

aecidial1876

pycnidial1877

teleutosporic1880

sorediate1881

pollinodial1886

peridial1887

promycelial1887

mycelian1891

uredosporiferous1895

uredosporous1895

hemiangiocarpous1900

uredinial1900

periplasmic1901

hemiangiocarpic1902

wefted1902

zygophoric1904

aecial1905

pycnial1905

telial1905

sporodochial1913

holocarpic1916

uredinoid1929

uredial1937

monokaryotic1941

protoperithecial1948

parathecial1953

1931 E. E. Hubert Outl. Forest Pathol. ii. ix. 248 Taken in order of their development, the first stage, known as the pycnial stage, includes fruiting bodies called pycnia.

1992 Canad. Jrnl. Plant Sci. 72 627 The mean density of pycnial lesions on the youngest three leaves was used to assess disease severity.

ˈpycniospore n. a spore from a pycnium; a spermatium.

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