. Fungous diseases of plants, with chapters on physiology, culture methods and technique . DEW OF TREES Phylladinia Corylea (Pers.) Karst. Palla, E. Ueber die Gattung Phyllactinia. Ber, d. deut. hot. Ges. 17: 64- 72. 1899-Salmon, E. S. On Certain Structures in Phyllactinia. Journ. Bot. 37: 449-454. //. 402. 1899. This species of mildew is so distinct from those previously dis-cussed that it is by somemade the type of a sub-family. As previouslystated, no haustoria areprfesent, but special seta-like branches penetratethe host. The peritheciumis large and provided withhyaline, rigid, acicu
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . DEW OF TREES Phylladinia Corylea (Pers.) Karst. Palla, E. Ueber die Gattung Phyllactinia. Ber, d. deut. hot. Ges. 17: 64- 72. 1899-Salmon, E. S. On Certain Structures in Phyllactinia. Journ. Bot. 37: 449-454. //. 402. 1899. This species of mildew is so distinct from those previously dis-cussed that it is by somemade the type of a sub-family. As previouslystated, no haustoria areprfesent, but special seta-like branches penetratethe host. The peritheciumis large and provided withhyaline, rigid, acicular ap-pendages, each with a swol-len base. There are manyasci, containing 2 or 3spores (Fig. 86, c). The de-velopment of the asci hasbeen discussed (Fig. 85). This species occurs morecommonly upon shrubs ortrees, but it is also para-sitic upon a limited num- ^^- 95- Bellow Leaf of Maple, with, r 1 1 Green Areas occupied by Uncinula ber 01 herbaceous plants. It is known to be distributed throughout the northern hemisphere,and is frequently one of the more common of the surface 2 32 FUNGOUS DISEASES OF PLANTS XXXI. HYPOCREACE^ In this family the mycehum is Ught or bright colored, neverdark, as is also the stroma when present. Perithecia are alsocolored and vary from a buff or yellow to brown, red, or purple,never black. They are usually more or less flask-shaped, freeupon the substratum, borne upon a mycelial weft (subiculum),upon a stroma, or imbedded partially or completely in a stroma(well-differentiated perithecial walls are absent in Claviceps, etc.).The perithecium possesses a distinct ostiolum or mouth. Theasci are cylindrical or clavate fusiform. The spores (usually eight)are diverse in form, and they sometimes bud within the ascus. Pa-raphyses may be present. In general, the family is distinguishedfrom other pyrenomycetes only by color and texture. In this large family important pathological forms may be se-lected from three genera, — Neocosmospora, Nectria,
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