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Noble, M. 1948: Seed-borne diseases of clover. Transactions of the British Mycological Society 30: 84-91.

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Noble, M. 1948: Seed-borne diseases of clover. Transactions of the British Mycological Society 30: 84-91.
Transactions of the British Mycological Society
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Sclerotinia spermophila Noble 1948
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Trifolium repens L.

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Sclerotinia spermophila Noble 1948
Sclerotia black, irregular in shape, often spherical, 0.5-1.5 mm. diam. Apothecia arising singly or in small groups from sclerotia, cup-shaped, becoming flat. Disk 0.5-1.5 mm. diam., cinnamon-brown (Ridgway). Stipe of the same colour as the disk at the top but darkening to black at the base, hairy, 1-9 mm. long, 0.5 mm. diam. Asci cylindrical 153-215 x 11-18 µ, average of fifty, 179 x 14 µ, apex slightly thickened and staining blue with iodine, spores occupying half the length. Ascospores 8, generally uniseriate, ellipsoidal, hyaline, continuous, 12-19 x 7-12 (13) µ, average of 100, 15 x 9 µ. Paraphyses branched at base, slightly thickened terminally, of the same length as the asci. Macroconidial stage of the Botrytis type, conidiophores usually arising singly bearing the conidia in small groups on short sterigmata. Conidia hyaline, oval to long oval, (7) 10-18 x (4) 6-10 µ, average of 100, 12.4 x 7.5 µ. Microconidia small, globose, approx. 3 µ diam., hyaline, with one guttule, arising exogenously on penicilloid conidiophores.
in seeds of white clover, particularly of New Zealand origin.

Species affinis Sclerotiniae trifolii Erikss. atque S. minor Jagger a quibus conidiis formam eorum in genere Botryti simulantibus differt.

Sclerotia nigra, ambitu irregularia, saepe sphaerica, 0.5-1.5 mmdiametro. Apothecia solitaria vel nunc e sclerotiis simuli enata primum .poculiformia deinde plana. Discus 0.5-1.5 mm. diametro, cinnamomeobrunneus, stipite ad apicem similiter colorata sed basi nigrescente villosula 1-9 mm. longa, 0.5 mm. diametro. Asci cylindracei, 153-215 µ longi, 11-18 µ crassi (in medio 179 x 14 µ). apice parce incrassati, tincturam iodinam admittentes, ad medio sporis impleti. Ascosporae 8, plerumque uniseriatae, hyalinae ellipsoideae, 12-19 x 7-12(13) µ (in medio 15x19 µ). Paraphyses basi ramosae, apice paulo incrassatae, asco aequilongae. Macroconidiorum origo ad modum generis Botrytis, conidiophoris plerumque solitariis, conidiis in soros parvos sterigmatibus brevibus dispositis, hyalinis, ovalibus vel ellipsoideo-ovalibus, (7) 10-18 x 6-10 µ. Microconidia pusilla, globosa, circ. 3 µ diametro, hyalina guttula unica praedita, conidiophoris penicilloideis suffulta, extrinsecus orta.

Hab. In seminibus trifolii repentis praesertim ex Nova Zelandia importatis.

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1cb0e11c-36b9-11d5-9548-00d0592d548c
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Names_Fungi
6 March 2003
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