what you got there is a female tenebrosum with some some degree of hermaphrodism.
catasetum tenebrosum usually produces spike when the growth is relatively immature, even before the PB is taking shape. what i deduce from your pic is that the tip of growth had suffered tip rot and thus appears truncated in your pic and in the same time produces the spike.
tip rot can occur occasionally, some people belief it is due to water lodge in the tip due to watering but i do not belief it is the whole truth to it or else most of the catsetum in the wild would be dead once expose to rain (IMHO).
keep the small bulb safe, it will produce new growth in the coming cycle.
(high lighting condition, robust plant under optimal growth condition favors development of female flower in catasetum, but from my personal observation, i suspect sometimes some degree of infection in a particular plant do induce female flower formation as well.
i bought an incurvum plant with spike when i started into this genera, not knowing it was an infected plant. the subsequent growth, a smaller one developed female spike (hard to come by for this species) and i was thrilled. however, the excitement was short and soon i was facing the possibility of losing the plant.......well, almost.
and again i notice similar presentation when i visited my friend's collection, she had a couple of plants doing the same thing.
(a robust plant that have female spike occur naturally usually have more female flowers in a single spike, often five or more) Here in this tenebrosum only two female flowers and this division has only one single decent PB, making me belief that the female spike was form due to the stress from infection of the growth.
one might ask, why a female flower in presence of infection? i would say it is for SURVIVAL. a natural response of a living organism when their life is in threat, producing a female spike hoping for producing seed pods so that they can continue their existence.
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