The Flatford Mill Foray

[ 179 ] THE FLATFORD MILL FORAY 7-9 May 1948 By G. C. AINSWOR TH, Foray Secretary The twenty-ninth Spring Foray was held at the Flatford Mill Field Centre of the Council for the Promotion of Field Studies from Friday, 7 May to Sunday, 9 May 1948. Flatford Mill is situated in the parish of East Bergholt on the Suffolk bank of the River Stour about four miles from Manningtree station. Downstream the river is tidal and the valley quickly opens out into extensive salt marshes. Upstream towards Dedham (two miles away) there are fresh-water marshes and on the higher ground areas of woodland. The Centre caters for students of diverse interests, and the old mill and adjacent buildings now comprise a well-equipped laboratory, lecture rooms, library and common room, together with a refectory and dormitory accommodation. The Society is greatly indebted to the Warden, Dr E. A. R. Ennion, for his warm welcome and for all that he and his staff did as guides and advisors to make the foray both pleasurable and mycologically profitable. Friday's excursion was to Dedham where a halt was made for lunch and liquid refreshment. The outward route was on the Suffolk side of the river, the return route on the Essex bank and among other interesting finds were Clasterosporium caricinum, which had previously only been reported in this country from Norfolk, and Leptosphaeria sowerbyi on dead Scirpus lacustris culms. The next day the party went farther afield to the saltings and patches of woodland on the Essex bank of the Stour below Mistley when fine weather again added much to the day's enjoyment. Puccinia adoxae and Uromyces scillae were found in abundance, as was Entyloma ficariae. Lasiosphaeria spermoides was found in association with Armillaria mellea and a fine growth of Monilia aurea was noted. On Sunday, 9 May, the higher ground to the north-west of the Centre was worked and though the woods were dry the collections were up to the average for the spring. A complete list of the species recorded is appended. Specimens of many have been deposited at the Centre, while others may be found in the herbarium of the Commonwealth Mycological Institute, Kew. Acknowledgement is made to all those who contributed to the list, and particularly to Mr and Mrs M. B. Ellis for many records and specimens, and to Dr R. W. G. Dennis who kindly examined collections of discomycetes.

List ofthe species recorded during the Foray n= banks ofStour between Flatford and Dedham; F=woods and marshes near Flatford ; M=Mistley. PHYCOMYCETES ENTOMOPHTHORALES

Entomophthora aphidis Hoffm., on an aphid on nettle, D. 12-2

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Transactions British Mycological Society

ASCOMYCETES T APHRINALES Protomyces microsporus Ung., on Sium erectum, D. DISCOMYCETES

Aleuria repanda (Fr.) Gill., M. Ascobolus furfuraceus Fr., F. Calloria fusarioides (Berk.) Fr., on Urtica, F. Cheilymenia stercorea (Pers.) Boud., F. Ciliaria scutellata (L.) Boud., F. Dasyscypha virginea (Batsch) Fuckel, on Quercus cerris, F. Lasiobolus equinus (Mill.) Karst. Orbilia xanthostigma Fr., F. Rutstroemia nervisequia (Schroet.) White, on Alnus (leaves), D. Sclerotinia candolleana (Lev.) Fuckel, D. Trichobelonium asteroma (Fuckel) Rehm, on Carex riparia, D. PYRENOMYCETES

Chaetomium elatum Fr., on wheat stubble, D. Chaetosphaeria phaeostroma (Dur. & Mont.) Fuckel (with Diatrype stigma), on flex, D.,M. Daldinia concentrica (Fr.) Ces. & de Not., on ash, D., M., elm, F. Diaporthe leiphaemia (Fr.) Sacc., on Quercus robur, F. Diatrype disciformis (Fr.) Fr., F., stigma (Fr.) Fr., on Corylus, F., Fraxinus, M. Diatrypella quercina (Fr.) Cooke, F. Didymosphaeria palustris (B. & Br.) Sacc., on Carex acutiformis, F. Epichloe typhina (Fr.) Tul., on Dactylis, D. Hypoxylon fuscum (Fr.) Fr., on Alnus, D., Corylus, M., F., howeianum Peck, on Corylus,F., multiforme (Fr.) Fr., on Betula, F., rubiginosum (Fr.) Fr., on Fraxinus, M., semiimmersum Nits., on Sambucus, M., Quercus, F., serpens (Fr.) Fr., M. Lasiosphaeriahirsuta (Fr.) Ces. & de Not., M., spermoides (Fr.) Ces. &de Not. (associated with Armillaria mellea rhizomorphs), M. Leptosphaeria acuta (Fr.) Karst., on nettle, F., arundinacea (Fr.) Sacc., on Phragmites communis, F., (Leptosphaeria) culmicola (Fr.) Karst., on Phalaris arundinacea and wheat stubble, D., nigrans (Desm.) Ces. & de Not., on wheat stubble, D., sowerbyi (Fuckel) Sacc., on Scirpus lacustris, D. Libertella blepharis A. L. Sm., on Sorbus aucuparia, M. Melanopsamella inaequalis (Grove) v. Hohn., on Fraxinus, M. Nectria punicea (Fr.) Fr., on ivy, F. Ophiobolus eucryptus (B. & Br.) Sacc., on Carex acutiformis, F. Ophiosphaeria gracilis (Niessl) Kirsch., on Carex and Glyceria, F. Rosellinia aquila (Fr.) de Not., on Ulmus and flex, M. Trichosphaeria myriocarpa (Fr.) Petrak & Syd., on Fraxinus, M. Xylaria hypoxylon (Fr.) Grev., M., F.

H YSTERIALES Hysterium angustatum (Fr.) Grev., on Fraxinus, M. Lophodermium arundinaceum (Fr.) Chev., on wheat stubble, D. Phaeidium multivalve (DC.) Kunze & Schm., M., F. Stegia ilicis Fr., D., M., F. BASIDIOMYCETES UREDINALES

Melampsora rostrupii Wagner, on Mercurialis perennis, F. Phragmidium fragariastri (DC.) Schroet., on Potentilla sterilis, D., mucronatum Fr., D. Puccinia adoxae Hedw. f., M., caricis Reb., on Carex and Urtica, F., epilobii DC., D., lapsanae Fuckel, D., malvacearum Mont., D., persistens Plowr., on Thalictrum jlavum, D., scirpi DC., D., suaveolens Rost., D., M., taraxaci Plowr., D., F.

The Flatford Mill Foray

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Triphragmium ulmariae Wint., F. Uromyces acetosae Schroet., D., ficariae (Schum.) Lev., D., M., F., poae Rabenh., on Ranunculus and Poa, M., D., scillarum Wint., M. USTILAGINALES

Entyloma fergussoni (B. & Br.) Plowr., on Myosotis palustris, D., ficariae Berk., M., F. Ustilago longissima (Schlecht.) Meyer, D., F., violacea (Pers.) Rous., F. HYMENOMYCETES

Amanitopsis vaginata (Bull.) Roze. Armillaria mellea (Vahl) Fr., M. Coprinus lagopus Fr., F., micaceus (Bull.) Fr.,D., M., radians (Desm.) Fr. (mycelium), D. Hypholoma fasciculare (Huds.) Fr., D. Marasmius oreades (Bolt.) r-., D., M. Pluteus cervinus (Schaeff.) Fr., M., F. Psalliota campestris (L.) Fr., M. Schizophyllum commune Fr., F. Tricholoma gambosum Fr., D. Ganoderma applanatum (Pers.) Pat., F. Polyporus brumalis (Pers.) Fr., F., caesius (Schrad.) Fr., F. squamosus (Huds.) Fr., F. Polystictus versicolor (L.) Fr., F. Auricularia auricula-judae (L.) Schroet., M., F. Irpex obliquus Fr., M., F. Stereum purpureum (Fr.) Fr., on blackthorn, D., lime, F. GASTEROMYCETES

Bovista nigrescens Pers., D. Lycoperdon caelatum (Bull.) Fr., D. FUNGI IMPERFECTI Acrothecium simplex B. & Br., on Urtica, F. Arthrinium puccinioides Fr., on Carex, F. Botrytis cinerea Fr., D. Clasterosporium caricinum Schw., on Carex riparia, D. Colletotrichum graminicola (Ces.) Wils., on Glyceria, D. Cytospora rhodophila Sacc., on Rosa canina, M., rosarum Grev., M. Dendryphium comosum Wallr., on Urtica, F., laxum B. & Br., on wheat stubble, D. Didymaria didyma (Unger) Schroet., on Ranunculus repens, D. Epicoccum purpurascens Wallr., on Carex and TYpha, D. Helminthosporium simplex Fr., F., M., velutinum Fr., on Hedera helix, F. Leptostroma spiraeinum Vesterg., on Filipendula, F. Monilia aurea Auct., M. F. Neottiospora caricinum Desm., F. Ovularia obliqua (Cooke) Oudem., on Rumex, D., F. Pachnocybe grisea Berk., on Quercus, F. Papularia sphaerosperma (Fr.) v. Hohn., on Phragmites, F. Periconia byssoides Corda, on Urtica, F. Phaeoisaria cornui (Bain.) Mason, M. Phoma sambuciphila Oudem., M. Phyllosticta hedericola Dur. & Mont., D. Septoria caricola Sacc., D., rubi Westend., D. Stagonospora caricis (Oud.) Sacc., D., sparganii All., D., F. Torula herbarum Fr., on wheat stubble, D., Urtica, F. Trichoderma viride Fr., F. MYXOMYCETES Arcyria denudata Wetts., F. Ceratomyxa fructiculosa Macbr., F. Lycogala epidendrum Adans., M., F. Reticularia lycoperdon Bull., F.