 Item number, SCP-199, Object Class, Plant, Containment Class, Euclid. Special Containment Procedures. A garden of SCP-199 has been built at Site-19 for research and containment. The garden is kept in a ventilated containment unit with artificial light suitable for plant growth and an automatic watering system. The ceiling is covered with an electrified grate capable of destroying instances of SCP-199-2. The entire chamber is to be surrounded with a Faraday cage to prevent a mission of SCP-199-3. Instances of SCP-199 or SCP-199-2 found outside of containment are to be destroyed with fire or pesticides. SCP-199 is a species of fern within the Hymenophilaceae family. SCP-199 is tangentially related to filmy ferns, but is more tolerant to temperature, humidity, pollution, and external damage. The rhizomes of the plants can attach to and grow on most solid surfaces. SCP-199's appearance is similar to that of Thalos liverworts, but its fronds are unique to its species. The fronds of SCP-199 will form into bladders approximately 10 cm in diameter, designated SCP-199-2. Eventually, they will fill with hydrogen gas generated by SCP-199, detach from the main plant, and drift into the air. SCP-199-2 will eventually float at 1 mile above sea level and begin to ripen. During this period, SCP-199-2 will emit SCP-199-3 at an initial rate of 1 signal per hour, steadily increasing as SCP-199-2 ripens. Once SCP-199-2 is ripe, it will burst, releasing its contents. In most cases, SCP-199-2 is empty, and its explosion will not have any consequences. Occasionally, the explosion of SCP-199-2 will release seeds that grow into new instances of SCP-199. SCP-199-3 refers to radio signals produced by SCP-199-2. All radio signals consist of a high-pitched male voice, speaking in Mandarin Chinese, giving analysis reports, consisting of observations made from SCP-199-2 and status reports of SCP-199-2 itself. Analysis of SCP-199-2 has shown that neither the source of the voice nor the radio signals exist, as most instances of SCP-199-2 are empty. SCP-199 seems to thrive in polluted environments, implying that it is adapted to grow in heavily populated areas. In addition, SCP-199-2 is resistant to most pesticides. SCP-199-2 is most commonly seen growing in chimneys, gardens of large cities, and inside of industrial factories. SCP-199-2 was originally discovered after residents of Xi'an, China reported balloon-like objects colliding with hotels and interference with radio devices. The source of SCP-199-2 was found to be a patch of it within the center of the city. Instances of SCP-199 have been since discovered in several large cities, most notably New York City, Los Angeles, San Francisco, Beijing, and Tokyo. Instances of SCP-199-3 From 09-12-2017 to 09-19-2017, large-scale analysis of SCP-199-3 was conducted by the Foundation. Large containment cell number 45 at Site-9 was temporarily converted into a simulated urban area. Five instances of SCP-199 were moved to the area for testing. The following is a transcript of SCP-199-3 transmissions, as well as notes in italics. This is Staff Man Fox Tale, launched successful, entering watching mode. Transcript of SCP-199-3 after launch of SCP-199-2, name and rank vary per instance. Targets found, beginning following mode. Transcript of SCP-199-3 after floating above simulated civilians. Transcripts performing clumping, engaging. Targets entering phase, engaging. Transcript of SCP-199-3 after floating above a gathering of simulated civilians. Engaging in Armageddon. Transcript of SCP-199-3 after floating above a gathering for two minutes. Armageddon failed, disengaging. Transcript of SCP-199-3 after floating above a gathering for five minutes. It is unknown what would occur if Armageddon was successful. Evasive drift initiated, course moved. Obstacle encountered, moving from course. Transcript of SCP-199-3 while avoiding buildings. Single target engaged in protection lists, retreating. Transcript of SCP-199-3 after floating above a member of D-class personnel, disguised as a New York citizen on a balcony. Single target engaged in that of protection, standing by. Transcript of SCP-199-3 after floating above a member of D-class personnel disguised as a New York citizen on a balcony, while the balcony had flowers. Non-target found without that of protection, colored blue. Transcript of SCP-199-3 after floating above a balcony with flowers without a civilian. Color changed depending on type of flower. Plane position recovered, entering malign phase. After this was recorded, SCP-199-2 instances actively avoided balconies. Unintelligible. The Paragon. Emitted by a contained instance of SCP-199-2 while floating above Site-19. Payload ready for deployment soon. Standing by. SCP-199-3 as SCP-199-2 became close to explosion. Sorry, it looks like we have a May Day here. Please avoid future infertility. SCP-199-3 before explosion, when SCP-199-2 was empty. We have a complete deployment ready. Pleasure to serve you, sir. SCP-199-3 before explosion, when SCP-199-2 had spores. If you could tell them I loved them. One instance of SCP-199-2 emitted this while idle and appeared to be cut off mid-sentence. Context unknown. Many variations and idle phrases cut out of this document. Addendum. On 09-21-2018, residents of Istanbul, Turkey reported a collective cloud of over 50 instances of SCP-199-2. Before a task force could respond to this, all instances simultaneously burst. Instead of seeds, SCP-199-2 released an acidic slime that caused severe damage to a road intersection and created three casualties. An ongoing disinformation campaign was released, crediting the source of SCP-199-2 to be a bio-terrorist attack. The source of this phenomenon was identified to be a patch of SCP-199 on the outskirts of Istanbul. The task force attempted to use fire to destroy these plants. However, SCP-199 reacted with a fire and exploded into acidic green slime, injuring five Foundation agents. Following destruction of the patch, analysis of the soil revealed that SCP-199 had been planted there four weeks earlier. This new variant of SCP-199 has been tentatively designated SCP-199-B. SCP-199-B has also been reported in Mumbai, Lagos, and Mexico City. Near the patch found in Lagos, a partially biodegraded plastic seed packet was recovered buried underground. The front of the packet had a symbol resembling an eye, with a red iris, with a green substance covering a third of the eye. The back of the packet had a symbol strongly resembling the Foundation's shield logo, but with the arrows pointing away from the shield, and three vertical bars covering the shield's inner circle. Lesson complete. If you missed the previous orientation, go watch SCP-198, Cup of Joe, right now. Or for the complete course, watch this playlist.