Immature stage of chocolate tube slime mold (Stemonitis splendens or may be fusca) on a log on Stubblefield section of Lone Star hiking trail north from Trailhead No. 6 in Sam Houston National Forest. Texas, March 29, 2020
Tubes and wires of Saturn Rocket in NASA Space Center Museum. Houston, Texas, February 16, 2008
Brown sporangia of chocolate tube slime mold (Stemonitis fusca) on a fallen pine on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, February 9, 2019
Brown sporangia of chocolate tube slime mold (Stemonitis splendens or may be fusca) on Stubblefield section of Lone Star hiking trail north from Trailhead No. 6 in Sam Houston National Forest. Texas, March 29, 2020
A tube of Heathrow Central subway station. London, Great Britain, January 11, 2006
Gregg s tubetongue (Hairy Tube tongue, Justicia pilosella, Siphonoglossa pilosella) in Zilker Botanical Gardens, Austin, Texas, March 7, 2009
Cluster of fruiting bodies of chocolate tube slime mold (Stemonitis splendens) on a pine log near Forest Service Road 203 in Sam Houston National Forest. Richards, Texas, September 28, 2013
Mysterious tubes on north-east shore of Lake Bryan. Bryan, Texas, November 30, 2008
Close up of chocolate tube slime mold (Stemonitis fusca) on a fallen pine on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, February 9, 2019
Chalky white tubes of calcareous tubeworms (Serpula, polychaeta) in Al Aaliya Island (Jazirat al Aliyah). Qatar, March 27, 2013
Tall brown sporangia of chocolate tube slime mold (Stemonitis splendens or may be fusca) covering pine log near Forest Service Road 203 in Sam Houston National Forest. Richards, Texas, September 28, 2013
Masses of tubes from a window of Room 1-2244 of Ezdan Hotel. Doha, Qatar, August 21, 2015
Ventilation tubes on Moskatelny Pereulok near Griboedov Canal. Saint Petersburg, Russia, August 11, 2012
Vintage vacuum tube in camping trash revealed by fire in Bastrop State Park. Bastrop, Texas, December 25, 2011
Tube (Trubnaya) Lane on Volkovo Cemetery. Saint Petersburg, Russia, October 17, 2016
Fall colors of Tube (Trubnaya) Lane on Volkovo Cemetery. Saint Petersburg, Russia, October 17, 2016
Hooded tube lichen (Hypogymnia physodes) on a pine tree west from Dibuny - Pesochny area near Saint Petersburg. Russia, February 4, 2017
Chocolate tube slime mold (Stemonitis splendens or may be fusca) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, March 10, 2018
Hooded tube lichen (Hypogymnia physodes) on a pine near Kuzmolovo, north from Saint Petersburg. Russia, May 8, 2019
Hooded tube lichen (Hypogymnia physodes) on pine bark in Zakhodskoe (Lounatjoki), 50 miles north from Saint Petersburg. Russia, May 9, 2019
Hooded tube lichen (Hypogymnia physodes) on pine bark in Kannelyarvi, 45 miles north from Saint Petersburg. Russia, May 25, 2019
Brown polypore fungus Xanthoporia andersonii (Inonotus andersonii) with with thick outgrowths of tubes underneath of a fallen oak on Winters Bayou Trail in Sam Houston National Forest. Cleveland, Texas, February 1, 2020
Cut piece of a brown resupinate polypore mushroom Xanthoporia andersonii (Inonotus andersonii) with thick outgrowths of tubes on Winters Bayou Trail in Sam Houston National Forest. Cleveland, Texas, February 1, 2020
Chocolate tube slime mold (Stemonitis splendens or may be fusca) on rotting wood on Stubblefield section of Lone Star hiking trail north from Trailhead No. 6 in Sam Houston National Forest. Texas, March 29, 2020
Chocolate tube slime mold (Stemonitis splendens or may be fusca) on a stump on Stubblefield section of Lone Star hiking trail north from Trailhead No. 6 in Sam Houston National Forest. Texas, March 29, 2020
Hooded tube lichen (Hypogymnia physodes) on pine in Kannelyarvi, 45 miles north from Saint Petersburg. Russia, May 25, 2019
Cut tubes on a cut of piece of a brown resupinate polypore mushroom Xanthoporia andersonii (Inonotus andersonii) on Winters Bayou Trail in Sam Houston National Forest. Cleveland, Texas, February 1, 2020
Pitch tube of black turpentine beetle (Dendroctonus terebrans(?)) in a pine on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, September 26, 2020
Pitch tube of black turpentine beetle (Dendroctonus terebrans) on a pine on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, November 26, 2020
Close-up of semitransparent tubes of slime mold Stemonitis fusca(?) on a fallen oak in Lick Creek Park. College Station, Texas, July 20, 2021
Curved white tubes of slime mold Stemonitis fusca(?) on a fallen oak in Lick Creek Park. College Station, Texas, July 20, 2021
Tube galls caused by a midge Cecidomyia viticola on a leaf of mustang grape on Stubblefield section of Lone Star hiking trail north from Trailhead No. 6 in Sam Houston National Forest. Texas, April 27, 2022
Close-up of tube galls caused by a midge Cecidomyia viticola on a leaf of mustang grape on Stubblefield section of Lone Star hiking trail north from Trailhead No. 6 in Sam Houston National Forest. Texas, April 27, 2022
One tube of slime mold Tubifera dimorphotheca in iodine solution under a microscope at very low magnification, collected in Sam Houston National Forest north from Montgomery. Texas, May 7, 2022
Tube margin of slime mold Tubifera dimorphotheca in iodine solution under a microscope at low magnification, collected in Sam Houston National Forest north from Montgomery. Texas, May 7, 2022
Spores(?) and a tube margin of slime mold Tubifera dimorphotheca in iodine solution under a microscope, collected in Sam Houston National Forest north from Montgomery. Texas, May 7, 2022
Spores of a red tube bolete mushroom Boletus flammans(?) collected on Four Notch Loop Trail of Sam Houston National Forest near Huntsville. Texas, July 26, 2022
Hooded tube lichen (Hypogymnia physodes) on a fallen pine twig near Orekhovo, north from Saint Petersburg. Russia, August 1, 2024
Enclosed pedestrian overpass at the Kannelyarvi railway station, located on the Karelian Isthmus roughly 75 km northwest of St. Petersburg. This overpass is a modular steel structure clad in translucent polycarbonate panels. The structure is a characteristic example of the standardized "blue tube" pedestrian bridges installed by Russian Railways (RZD) during the widespread modernization of the St. Petersburg-Vyborg line in the late 2000s. Russia, October 1, 2025
Pore Structure of mature beefsteak fungus (Fistulina hepatica) from a huge old oak in Dubki Park. In the close-up of the underside, one can see that the tubes are separate from one another (like packed straws) rather than fused into a solid sponge. Sestroretsk near Saint Petersburg, Russia, October 9, 2025
A network of heavily rusted, interconnected pipes is positioned above a patch of bare dirt and dry, dormant brush. Supported by thick vertical stands, the horizontal piping is outfitted with an array of industrial hardware, including multiple pressure gauges (manometers) and a prominently featured red pneumatic control valve. Snaking between these various instruments and the main pipes are several runs of very thin, bright, and shiny silver tubing, creating a sharp visual contrast against the deep rust of the primary framework. Although the complex arrangement of pipes and dials might superficially resemble a distillation apparatus, it is actually a surface wellhead and production manifold used in the oil and gas industry. These structures are critical components installed at the surface of an extraction site to safely control, monitor, and route the high-pressure flow of hydrocarbons coming from an underground well. The various valves act as "chokes" to regulate the flow rate of the extracted oil or gas, while the intricate tubing feeds the product to the manometers and pneumatic controls to constantly monitor system pressure and ensure safe operation. Northern side of Flag Pond on Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, March 14, 2026
