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Orihraria argillacea, Pers., Obs., i., p. 90; Rost., Mon., 239 ;
Cooke. M)’x. Brit., 59; Sacc., Syll., 1418; Raunk., p. 51,
t. ii., f. 8.
Exsicc.—Cooke, Fung. Brit., ser. ii., 526.
On wood. Britain (Smethwick, Brandon, Carlisle) ; Germany ;
Denmark; France; United States.
Characterized by the sessile or subsessile sporangia, absence
of calyculus, and in the granular swellings of the thickened
portions of the capillitium not being confined to the nodes.
(Rostafinski’s Synonyms.)
Stemonitis sphaerocarpa, Schr., Bot. Mag., xii. 20 (1790).
Stemonitis argillacea, Pers., in Gmel., 1409 (1796).
Gribraria argillacea, Pers., Obs., i. 90 (1796); B. and Br.,
Ann. Nat. Hist. (1865), no. 1036; Cooke, Hdbk., 1168;
Fung. Britt., ii. 526.
Gribraria micropus, Schrad., t. ii., f. 1—2 (1797).
Trichia argillacea, Poir., Ency., viii., no. 32 (1808).
* Netioorlc not thickened at the angles.
Gribraria minutissima, Sz.
Sporangia globose, stipitate, ealycwhis absent, permanent ribs
thin, forming a more or less uniform reticulation; angles not at
all, or very slightly enlarged, rarely enclosing a few granules ;
stem filiform, larger than sporangium, erect or curved above,
brownish; spores globose, almost colourless, minutely warted,
4—6 g diameter.
Gribraria minutissima, Schweinitz, in Syn. Fung. Amer. Bor.,
no. 2362; Rost., Mon., App., p. 31 (Excl. Syn. G. minima,
B. and C.); Sacc., Syll., 1405 (Excl. Syn. G. minima, B.
and C.).
(Specimen in Hb. B. from Schweinitz.)
On decaying pine wood. United States.
Scattered, very minute, from -5—1 mm. high, recognized at
once by the absence of a calyculus and absence of enlarged.
angles in the network. Stem from 2—3 times as long as
sporangium.
D ic t y d ium , Sclnad.
Wall of sporangium single; permanent rib-like thickened
portions radiating from base to apex and joined by numerous
thinner transverse bands; thinner portions of wall situated
between the ribs disappearing at maturity, or persistent at the
base and forming an imperforate calyculus; columella and
capillitium absent.
Dictydium, Schrad., Nov. Gen. PL, p. 11 ; Rost,, Mon.,
p. 229; Cooke, Myx. Brit., p. 57; Sacc., Syll., p. 410; Zopf,
p. 140.
The primary, vein-like, permanent portions of the sporangium
radiate from the base and converge at the apex without
becoming much broken up or distorted, although there is
usually an indication of a reticulate arrangement near the apex;
these primary ribs are united laterally by straight, thinner
portions, hence the arrangement of the skeleton is into more
or less regular- rectangular meshes.
Distrib. Europe; N. America; S. America; Ceylon; Australia :
species 2.
Dictydium cernuum, Nees. (f. 133).
Sporangium globose, cernuous, more or less umbilicate at
the apex, reddish brown; stem elongated, slightly thinner
upwards, with a sharp curve near the apex, above which the
stem is hyaline ami shrivelled at maturity; below the curve
dark broiun, opaque, smooth, passing into a small hypothallus ;
calyculus small; mass of spores purple brown; spores globose,
smooth, 5—7 g diameter.
Dictydium cernuum, Nees., Syst., f. 117; Rost., Mon., p. 229,
figs. 17, 19, 22; Cooke, Myx. Brit., p. 57, figs. 17, 19, 22;
Sacc., Syll., no. 1401; Scliroeter, p. 106; Raunk., p. 51, Tab.
ii. fig. 4.
Dictydium cernuum, var. laxum, B. and C., Grev. 1873, p. 67.
Akskc.—Fuckel, Fung. Rhen., 1445 and 2099 ; Syd., Myc.
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