An example for Tranzschel’s Law: a. Aecia (with orange aeciospores) of an Uromyces species (Uromyces pisi group = Aecidium euphorbiae s.l.) on Euphorbia cyparissias, a hetereu-form alternating between the Euphorbia (aecial host) and Fabaceae (telial host); b. Telia (with dark-brown teliospores) of Uromyces cf. alpestris, one of the related micro-forms on Euphorbia cyparissias. – In both cases, infected Euphorbia shoots usually do not flower, and their leaves are often distinctly shorter and broader than healthy ones; note the spermatogonia associated with both, aecia and telia; (a, b by Walter Obermayer).