Henry T. Tribe

Moulds that should be better known: Thielaviopsis basicola and T. thielavioides, two ubiquitous moulds on carrots sold in shops

Carrots, irrespective of their origin and whether they have been grown conventionally or organically, almost always harbour spores of Thielaviopsis basicola and T. thielavioides on their surface. Infections become visible as dark green mould patches upon prolonged incubation in polythene bags. These moulds produce beautiful asexual reproductive organs which are described here. We also present the first report of the previously unknown occurrence of repetitious conidial germination in both species.

Thielaviopsis basicola and T. thielavioides , two ubiquitous moulds on carrots sold in shops.

Carrots, irrespective of their origin and whether they have been grown conventionally or organically, almost always harbour spores of Thielaviopsis basicola and T. thielavioides on their surface. Infections become visible as dark green mould patches upon prolonged incubation in polythene bags. These moulds produce beautiful asexual reproductive organs which are described here. We also present the first report of the previously unknown ocurrence of repetitious conidial germination in both species.

A low-temperature fungus from cardboard, Myxotrichum chartarum

Myxotrichum chartarum, with its striking gymnothecia, should be better known. It is described and illustrated from cardboard in an unusual context and from culture.

The making of a model of Escherichia coli, magnified two million times — the ‘Millennium Bug‘

The author is making for the Millennium a model of Escherichia coli at 2x10(6) with emphasis on its interior composition. At this magnification molecules come into view and metabolic pathways are demonstrable as tangible systems of metabolites and enzymes interacting with one another. The model is intended to have value both for public understanding of science and in teaching of microbiology and biochemistry.