CRIA - Centro de Referência em Informação Ambiental
Fernando B. Matos
Vol. I, Part I, Fasc. See Urban Plate 1 (1906)CRIA - Centro de Referência em Informação Ambiental
Martius and the "espigas-de-sangue"
“The generative force of the earth [...] produces plant forms that deviate from the typical, resembling those of animals. Thus, from the mud emerges Helosis guyanensis; a phallic-like parasite, a fleshy, brownish-purple, leafless cone — a singular mushroom with flowers.”
Helosis cayanensis_v02 (November 22, 2013) by Marcelo Fragomeni SimonOriginal Source: specieslink
“The soil, almost entirely covered with putrefying matter [...] greatly favors the development of saprophytes; we noticed some gigantic cap mushrooms, which next to the strange red Helosis, similar to the phallus, seemed to characterize the appearance of these virgin forests.”
This is how Martius described his encounters with the “espigas-de-sangue” (“blood spikes”) in the Amazon, in the third volume of his book ‘Travels in Brazil’ (1831).
Obligatory parasites
Also known as “blood mushroom,” “dragon spike” and “urupê,” the species of the genus Helosis are parasites of various tropical plants. They do not perform photosynthesis and therefore depend entirely on the nutrients they steal from their hosts.
They look like mushrooms, but they’re not
They belong to the group of flowering plants (angiosperms), but are often confused with mushrooms, as their inflorescences are fleshy, red, and sprout close to the ground.
Velacho (Helosis cayennensis), Parana (September 26, 2020) by Marcelo BrottoOriginal Source: iNaturalist
The dragon spike flowers
Their flowers are completely covered with hexagonal bracts, which resemble the segments of a soccer ball or the scales of a reptile. These bracts fall off naturally, leaving the flowers exposed to pollinators.
Helosis cayennensis, Costa Rica (December 29, 2008) by Reinaldo AguilarOriginal Source: Tropicos
Female inflorescences
Here we see a female inflorescence without bracts. The numerous white filaments are the female flowers, which are among the smallest in the plant kingdom. Notice the large drops of nectar and also the scars on the bracts.
In the male inflorescences, each flower has three petals surrounding a group of three joined stamens. Although they are less numerous, these male flowers are much larger and more spaced out than the female ones.
Vol. IV, Part II, Fasc. 47 Plate 5 (1869-05-01)CRIA - Centro de Referência em Informação Ambiental
Stolons and tubers
In addition to the showy inflorescences, they have a complex underground system formed by stolons and tubers. The tubers store the nutrients extracted from the host plant and give rise to the stolons. The stolons spread through the soil and give rise to new inflorescences.
In Brazil, there are two species of Helosis. The one that Martius saw in the Amazon is Helosis cayanensis, a species widely distributed across tropical America.
The other is Helosis brasiliensis, a species endemic to the Atlantic Forest. It differs from Helosis cayanensis mainly in its more spherical inflorescences and pyramidal bracts (vs. rounded to truncated).
Langsdorffia (May 09, 2015) by Fábio Júnio Santos FonsecaOriginal Source: Wikimedia Commons
The Balanophoraceae family
The “blood-spikes” challenge almost everything we know about “conventional” plants. Click here to learn more about the Balanophoraceae, a botanical family that includes Helosis and 17 other amazing genera of parasitic plants.
Research and writing: Fernando B. Matos (CRIA)
Assembly: Fernando B. Matos (CRIA)
Review: Luiza F.A. de Paula (UFMG/CRIA), Renato De Giovanni (CRIA)
References: Flora Brasiliensis (http://florabrasiliensis.cria.org.br/opus); Travels in Brazil (https://www2.senado.leg.br/bdsf/handle/id/573991)
Additional information: http://florabrasiliensis.cria.org.br/stories
Acknowledgments: All the authors of the images and characters in the story.
*Every effort has been made to credit the images, audio, and video and correctly recount the episodes narrated in the exhibitions. If you find errors and/or omissions, please email contato@cria.org.br
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