. V. Tubeuf del.) up the epidermis into lobes. The thick asci contain two to four large two-celled spores. Paraphyses are present. A pycnidial form is known as Lcptothyrium 2:)tarmicae (Sacc). Rhytisma. The fungi of this genus live in the tissues of living plants and form sclerotial cushions as isolated black spots. In these places the pycnidia are developed, and are followed by apothecia after the death of the leaves. The apothecia open by a fissure, and contain thread-like paraphyses and club-shaped asci with eight needle-shaped spores, which are septate when mature. Rhytisma acerinum (Pers.
. V. Tubeuf del.) up the epidermis into lobes. The thick asci contain two to four large two-celled spores. Paraphyses are present. A pycnidial form is known as Lcptothyrium 2:)tarmicae (Sacc). Rhytisma. The fungi of this genus live in the tissues of living plants and form sclerotial cushions as isolated black spots. In these places the pycnidia are developed, and are followed by apothecia after the death of the leaves. The apothecia open by a fissure, and contain thread-like paraphyses and club-shaped asci with eight needle-shaped spores, which are septate when mature. Rhytisma acerinum (Pers.) (Britain and America). Tt)\var( the close of summer, the large black spots caused by this fungus on leaves of various species of Acer (sycamore and maple) are by no means uncommon. Pycnidia {Melasmia acerinum Lev.), containing little unicellular conidia, are first produced under the cuticle, while the epidermis and under- Iving cells become filled with mvcelium till a black sclerotium
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
