The male gamete of Plasmodium, the parasite responsible for causing malaria, is known as microgametocyte. Let's understand the different stages of Plasmodium's life cycle and how the male gamete is formed.

Plasmodium undergoes a complex life cycle that involves two hosts: a mosquito vector and a human host. The life cycle of Plasmodium consists of two alternating forms - the sexual cycle (gametogony) and the asexual cycle (schizogony).

1. Asexual Cycle:
- In the human host, Plasmodium enters the bloodstream through the bite of an infected mosquito and invades liver cells.
- Inside the liver cells, the parasite undergoes multiple rounds of schizogony, a process of asexual reproduction. The parasite replicates its DNA and divides multiple times to produce numerous merozoites.
- The merozoites are released from the liver cells and invade red blood cells (RBCs).
- Inside the RBCs, the merozoites further undergo schizogony, resulting in the release of more merozoites. This process leads to the destruction of RBCs, causing the characteristic symptoms of malaria.

2. Sexual Cycle:
- Some of the merozoites, instead of undergoing schizogony, differentiate into sexual forms called gametocytes.
- In the human host's bloodstream, both male and female gametocytes can be found. The male gametocyte is referred to as microgametocyte, while the female gametocyte is called macrogametocyte.
- When a female Anopheles mosquito feeds on the blood of an infected human, it ingests the gametocytes.
- Inside the mosquito's midgut, the macrogametocytes develop into macrogametes, while the microgametocytes develop into microgametes.

3. Formation of Male Gamete:
- The microgametocytes undergo a process called exflagellation, where the nucleus divides multiple times to form eight flagellated microgametes.
- Each microgamete has a flagellum that allows it to swim in the mosquito's midgut.
- The microgametes are released into the midgut lumen and actively seek out the macrogametes.
- Upon fertilization, the microgamete penetrates the macrogamete, resulting in the formation of a zygote.
- The zygote develops into an ookinete, which penetrates the mosquito's midgut wall and forms an oocyst.
- Inside the oocyst, further multiplication takes place, and eventually, thousands of sporozoites are formed.

In conclusion, the male gamete of Plasmodium is known as microgametocyte, which develops into microgametes. The microgametes are released into the mosquito's midgut, where they fertilize the female gametes and initiate the formation of sporozoites.