Triphragmium has teleutospores with three cells (one below and two above), on Spiræa ulmaria.
Phragmidium (Fig. [150]) has teleutospores consisting of a row of cells (3–10) arranged in a straight line; the upper cell has one germ-pore and the others four germ-pores placed equatorially. Both this and the preceding genus have large, irregular æcidia without peridia, but often with bent, club-like paraphyses (150 b and c); they are all autœcious, and are only found on the Rosaceæ.
Fig. 148.—Gymnosporangium sabinæ. A small portion of the epidermis of a Pear-leaf (a) pierced at b by the germinating basidiospore (c).
Fig. 149.—Uromyces genisteæ; a uredospore; b teleutospore.
Endophyllum (see above, under teleutospores, p. [147]) on species of Sempervivum.
Gymnosporangium (Figs. [152], [154]) has bicellular teleutospores collected in large, gelatinous masses formed by the swelling of the long spore-stalks; in each cell 2–4 germ-pores are found. Uredospores are wanting. All the species are heterœcious; the teleutospores appear on Juniperus, the æcidia (Rœstelia) on the Pomaceæ. G. sabinæ, on Juniperus sabina, J. virginiana, etc., has the æcidia (“Rœstelia cancellata”) on Pyrus communis (Figs. [152], [148]); G. juniperinum, on Juniperus communis with “Rœstelia cornuta” (Fig. [154] a) on Sorbus aucuparia, Aria nivea (S. aria) and Malus communis; G. clavariæforme on Juniperus communis, the æcidium belonging to it (“Rœstelia lacerata”) on Cratægus oxyacantha.
Melampsora has prismatic teleutospores placed parallel to each other and forming a crustaceous layer; in many species they are divided longitudinally into several cells (Fig. [151]). The æcidia, without peridium, belonged to the old genus Cæoma. M. caprearum, on Willows, has the æcidia (Cæoma euonymi) on Euonymus. M. hartigii, on Osiers; the æcidium on Ribes. M. mixta, on Salix repens and Orchids. M. pinitorqua, on leaves of the Aspen, æcidia on Pine branches (Pine shoot fungus); M. populina on Populus monilifera and nigra; M. betulina (Fig. [153]), on Birch leaves; M. padi (Fig. [151]), on leaves of Prunus padus, developes teleutospores in the epidermal cells; M. lini is the cause of injury to the Flax; M. agrimoniæ.
