210 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
Uredinales collected by Fred J. Seaver in Trinidad. — J. C. 
Arthur ( Mycologia , 1922, 14, 12-24). The list consists of seventy- 
one species collected during a six weeks’ visit to the island. Several 
species are new to science. An index of the species and of the host 
plants is appended. A. L. S. 
Life of Puccinia Malvacearum Mont, within the Host Plant 
and on its Surface. — Jakob Eriksson ( Phytopathology , 1921, 11, 
459-63). The author states that Avatering the soil with fungicides is 
harmful to the fungus. He describes the germination of two types of 
spores : — (1) Autumn spores, which in moist air form promycelia and 
sporidia, but under water germinate with long straight tubes, which at 
the tip liberate conidia, arranged like a string of beads ; (2) Summer 
spores, which occur from May to July, and germinate in all cases with 
long straight tubes bearing conidia. The sporidium attacks the host 
by penetrating the epidermis. The conidium infuses its contents as 
plasm into the epidermal cell ; the plasm penetrates the tissue of the 
host and constitutes a mycoplasm. A. L. S. 
Diagnoses of American Porias : I. — L. 0. Overholts (Mycologia, 
1922, 14, 1-11, 1 pi.). Three species have been fully redescribed and 
illustrated by the author. They are : Poria nigrescens , P . ferruginosa 
and P. ambigua ; they are European species that occur also in America. 
A. L. S. 
Mycological Notes.— A. van Luyk [Med. Van Rijks Herb., 1919-21, 
39, 1-10, 10 figs.). This paper deals with the Geoglossaceae of the 
Reich Herbarium at Leyden. The writer gives notes on Mitrula 
(two species), Microglossum olivaceum , Corynetes arenarius, nine species 
of Geoglossum, Trichoglossum hirsutum, and two species of Cuclonia. He 
discusses the characteristics and nomenclature of the various species. 
A. L. S. 
Longevity of certain Species of Yeast. — Arthur R. Ling and 
Dinshaw Rattonji Nanji ( Proc . Roy. Soc., 1921. 92, 355-7). The 
species of yeast were contained in tubes plugged with cotton wool and 
covered with sealing wax. They dated from 1887. It was found that 
all the eight cultures were living ; it was not possible to determine 
whether they had persisted as resting cells or as spores. A. L. S. 
Fungi Ascomycetes, Ustilaginales, Uredinales. — Dame Helen 
Gwynne-Vaughan ( Cambridge University Press, 1922, 232 pp., 196 figs.). 
This volume of Botanical Handbooks deals, as the title tells, with only 
some of the chief groups of Fungi, but there is a general introduction 
to the whole class which describes the vegetative structures and dis- 
cusses Saprophytism, Parasitism and Symbiosis. There is also a section 
devoted to some aspects of the physiological problems such as Chemo- 
tropism, Hydrotropism, etc. The first thirty-one pages are given 
to these general subjects. The special study of Ascomycetes — Plecto- 
mycetes (a new classification), Discomycetes and Pyrenomycetes — 
follows, and necessarily deals largely with their cytology. This subject 
is very fully described for the many different forms — primitive and 
