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THE BKITISH SMUT FUNGI 79<br />
On Carex arenaria, G. bigelowii, C. capilUtris, C.fiacca, C. nigra, C.panicea, and<br />
C. pulicaris [Plowright (1889) also gives C. praecox [G. caryophyllea], G. stdlatula<br />
[G. echinata], G. dioica,, G. pseudocyperus, and C. hirta]; Ehynchospora<br />
alba; Scirpus caespitosus.<br />
June-Sept. Widespread.<br />
Exsiccati: (as Ustilago urceolorum) Cooke, Fungi Brit. Exsicc., i, 541 (on Scirpus<br />
caespitosus (see Sadler, Trans. Proc. Edinh. hot. Soc, xi, p. 469, 1873); Vize,<br />
Micro. Fungi Brit., 131 (on Garex flacca).<br />
Spore germination. Brefeld (1895) obtained germination in spring'from spores<br />
which had been lying in damp soil since the previous season. The relatively<br />
thick promycelium became empty and septate in the older part, branched above<br />
the surface of the water and cut off oval sporidia which fell off and germinated<br />
to form mycelium (Fig. 5 d).<br />
A number of different species of Gintractia have been distinguished on Garex<br />
(seeLiro, 1938) and the forms on Ehynchospora and Scirpus are sometimes<br />
designated G. montagnei (Tul.) Magn. and C. scirpi (Kiihn) Schellenb., respectively.<br />
Of the British collections examined, only those of G. subinclusa (see<br />
below), with its coarsely warted spores, could invariably be distinguished morphologically<br />
from G. caricis.<br />
Cintraetia subinclusa (Korn.) Magn.<br />
Ustilago subinclusa Kornicke, Hedwigia, xiii, p. 159, 1874.<br />
Anthracoidea subinclusa (Korn.) Brefeld, 1895.<br />
Gintractia subinclusa (Korn.) Magnus, Abh. bot. Ver. Brandenb., xxxvii, p. 79,<br />
1896.<br />
Sori in the spikelets replacing the ovaries, partly hidden by the glumes, globose,<br />
3-4 mm. diam., each at first covered by a thin grey false membrane. Spore mass<br />
agglutinated, black, surrounding a central columella of host tissue. Spores<br />
globose, ellipsoidal, or somewhat elongated, dark brown with hyahne to tinted<br />
coarse wart-like projections, 12-20 ju. diam.<br />
On Garex riparia. -'* *<br />
Warwicks., Bradnocks Marsh (June, 1920), Hampton-in-Arden (June, 1922),<br />
near Tanworth Grove (see J. Bot., Lond., Ix, p. 168, 1922); Norfolk.<br />
Exsiccati: Berkeley, Brit. Fungi, 114 (as Uredo urceolorum).<br />
Spore germination is, according to Brefeld (1895), very similar to that of G.<br />
caricis, but the sporidia tend to be produced singly or in twos at the tips of the<br />
promycehal branches rather than in twos or threes (Fig. 5 c) as in C. caricis.<br />
Pohjakallio (1935) described the germination in G. karii Liro from Garex<br />
brunnescens (Pers.) Pon. The promycelia were often dilated at the apex and the<br />
sporidia developed on short sterigmata (Fig. 5 e). Gintractia pratensis Sydow<br />
from Garex recurva Huds. was studied by Cocconi (1893). Sporidia were lateral<br />
on a simple promycelium and budded in the medium.