So in the predawn light Sax wandered the rubble plowed up by the glacier’s passage: a little upright creature with a light shining out of his helmet, like some deep-sea fish poking about for food. Something in the sight made Nirgal’s throat tighten, and he suited up and went outside to keep the old man company.

He wandered through the lovely chill gray morning, stepping from rock to rock, following Sax in his winding course through the moraine. Illuminated one by one in the cone of Sax’s headlamp were eldritch little worlds, the dunes and boulders interspersed with spiky low plants, filling cracks and hollows under rocks. Everything was gray, but the grays of the plants were shaded olive or khaki or brown, with occasional light spots, which were flowers— no doubt colorful in the sun, but now light luminous grays, glowing among thick furry leaves. Over his intercom Nirgal could hear Sax clearing his throat, and the little figure pointed at a rock. Nirgal crouched to inspect it. In cracks on the rock were growths like dried mushrooms, with black dots all over their shriveled cups, and sprinkled with what looked like a layer of salt. Sax croaked as Nirgal touched one, but he could not say what he wanted. “R-r-r . . .”

They stared at each other. “It’s okay,” Nirgal said, stricken again by the memory of Simon.

They moved to another patch of foliage. The areas that supported plants appeared like little outdoor rooms, separated by zones of dry rock and sand. Sax spent about fifteen minutes in each frosty fellfield, stumbling around awkwardly. There were a lot of different kinds of plants, and only after they had visited several glens did Nirgal begin to see some that appeared again and again. None of them resembled the plants he had grown up with in Zygote, nor were they like anything in the arboretums of Sabishii. Only the first-generation plants, the lichens, mosses, and grasses, looked at all familiar, like the ground cover in the high basins above Sabishii.

Sax didn’t try to speak again, but his headlamp was like a pointed finger, and Nirgal often trained his headlamp on the same area, doubling the illumination. The sky turned rosy, and it began to feel like they were in the planet’s shadow, with sunlight just overhead.

Then Sax said, “Dr—!” and aimed his headlamp at a steep slope of gravel, over which a network of woody branches grew, like a mesh put there to hold the rubble in place. “Dr—!”

“Dryad,” Nirgal said, recognizing it.

Sax nodded emphatically. The rocks under their feet were covered with light green patches of lichen, and he pointed at a patch, and said, “Ap-ple. Red. Map. Moss.”

“Hey,” Nirgal said. “You said that really well.”